Acromegaly was first described by Marie as a disease entity in the late 1800s, literally translated the name implies large extremities, which seems an apt label. Even prior to 1900, it was believed that there was some association of the pituitary Gland with this is the disease. Later investigation has established that the basic disorder is an excess or inappropriate secretion of growth hormone produced by a pituitary tumor. Significant advances have been made both in diagnostic techniques and therapeutic management in recent years and our discussion will focus on these two aspects. We are fortunate in having two distinguished authorities in the field to discuss this disease. The first Panelist I would like to introduce is Dr William Dowd, who is professor of medicine and director of the metabolism division of Washington University School of Medicine. ST louis Missouri. Among his many important positions. He is also co editor of the journal of clinical endocrinology and metabolism. He has written many papers on the subject of endocrinology, including the chapter on the ad no hypothesis in William's textbook of endocrinology. Our other distinguished panelists is Dr William Collins, who is professor and chairman of the section of neurosurgery. Yale University School of Medicine, New Haven Connecticut. In addition to his duties at Yale Medical School, Dr Collins is a member of the american board of neurological surgery and also holds important positions in several neurosurgical societies over the past several years. Dr Collins has made many contributions on the subject of pituitary tumors as well as hypothesis. Ectomy. The overall organization of today's program will begin with a briefcase presentation by Dr Scott Mcclanahan, who is a resident in neurosurgery at Emory University School of Medicine. This will be followed by a discussion between the panelists and if time permits between the panelists and our audience, which consists of a nurse of a clinical specialist and for neurosurgical residents from Emory University. So at this point I will ask Dr Mcclanahan to present the case, which will serve as a starting point for our discussion. I would like to express our gratitude to our patients for coming here today to assist us in making this videotape dr Mcclanahan. This was the first hospital admission for a 35 year old man today, seated on my left who entered with a chief complaint of headaches and a progressive enlargement of his feet and hands of one year's duration over the same period of time. He had also noted changes in his facial features and morning joint stiffness and swelling of the ankles and hands. He had also noted some numbness and para seizures involving the thumbs and forefingers of both hands. These extremity symptoms and the joint stiffness would typically improve as the day progressed but would be worse again. The following morning sexual function was described as normal On examination. The patient's height was 72" and his weight was £184. On general physical examination. He was felt to be normal with the exception of puffiness of the face, hands and ankles and a deep voice and a grade 2/6. Systolic murmur heard best over the apex neurological testing. He was felt to have an entirely normal neurological exam. No visual field defect could be demonstrated grossly. Nor were there any other cranial nerve findings. An ophthalmological evaluation was obtained and this was felt to be normal with respect to visual acuity, ease and visual fields. A C. T. Scan was obtained and this was normal even with eight millimeter cuts through the area of the seller. A complete laboratory examination and endocrine neurological work up was normal. With the exception of growth hormones shown on the slide. The fasting level was elevated and this level did not suppress to normal values. Even with administration of a glucose load skull series obtained at an outside hospital including polit tomes of the cellar were interpreted as normal. Following his initial evaluation uh The patient was taken to the operating room where an open transfer nautile micro surgical removal of an eosinophilic adenoma was done. The adenoma measured eight x 8 x seven. At the time of surgery the patient's postoperative course was entirely uncomplicated and he was discharged On the 10th postoperative day following repeat testing of growth hormone levels which were shown to be normal. Both on fasting and on administration glucose to suppress to normal levels. Thank you. Dr mcclanahan. So either dr DAO day or dr Collins have questions for either are patient or doctor Mcclenahan? I'd like to ask the patient a few questions. This disease is very insidious and its onset and it's very difficult for the physician or the patient to recognize When it first began. I notice you're wearing a ring. Has it been necessary to increase the size of that ring? If so, when I did increase the size of the ring? Perhaps six months after the first come on symptoms. How about your shoe size? The shoe size, neck, collar size both changed and those also had to be increased about 6-8 months after first symptoms and a common complaint of other patients with this condition is excessive sweating. Have you had any of that? I did not know that if it was there. I understand you are quite athletic. Have you noticed any decrease in your ability to perform? I think perhaps uh the initial symptoms, the taking the numbness swelling did prompt a decrease in the desire to do basic cal aesthetics. But I did increase or rather sustained a jogging program. Even during the period that I was undergoing examination and has a dentist noted any change in your jaw? Not that was described to me. Thank you Dr Collins. I have a couple. You keep saying the first symptom. What was your first symptom? Her symptoms were swelling and pain in the lower extremities, the ankles and feet? All right. Dr McClellan. You mentioned in your history of paris? These asia's and particularly night para seizures the hand. Did you have anything in your work up that would indicate a peripheral neuropathy or an entrapment? Rap tunnel sign was slightly positive bilaterally, but there was no other suggestion of a peripheral and certainly in my experience it would be unusual to have a normal skull films in the face of anak metallic. I think certainly the volume of the seller may appear normal. If we take a look at these films, just go over a little more carefully perhaps first is this lateral I think really suggest the double floor that you can see the cone down view of the next film. I think it's even more apparent and this double floor as it's commonly called, even though the volume of the solo appears normal suggests an erosion on one side. If we go to the anterior posterior view, I think this is really shows slamming of the floor towards the left cone. Down on this next film, there is quite apparent. But the polit oma I think must verify this out. And if we have the next film on this lateral, I think you can see that the cortex of the floor of the seller is eroded here and about the mid portion as well as portion of it posterior lee where it's along the dorsal klein oid but in the anterior posterior polit. Um ah here there's really a definite break in the cortical continuity which is over on the left side probably is even more significant in the fact that the patient has been having symptoms which have been referred to this side. And in contrast to interpreting this normal, these are really quite confirmatory of a mass lesion in the cella, the Akram, a gallic patient. The tumor very often is in the lateral inferior portion of the gland and it has a very high incidence of pressure erosion of the floor of the cellar, which I think these films have. This this case is relatively early, brings up some I think interesting valuable points for our audience and I'm sure our audience would be interested in what you would consider important clinical findings to establish the diagnosis of acromegaly dr dowdy. I wonder if you could comment on that. I think our problem from the point of view of the internist or the primary physician is recognizing the early clues of acromegaly and instituting the proper screening tests. Some of the features presented by this patient are important. It's well to remember that the increasing the apparent size of the face and hands that occurs early in the disease is not that of bony enlargement but the soft tissue and swelling so that the change in appearance is important and many times we review family pictures to see if there really has been changed. I think that when we deal with pre pure little Children, we are on the lookout for accelerated growth velocity and the absence of perpetual changes. And this helps us recognize a rare case gigantism. Some of our patients are first recognized by the dentist in terms of an abnormality. Yeah. And bye. Would you consider signs such as symptoms of carpal tunnel compression of peripheral neuropathy? Important clinical signs. And I think they're important because there are signs that bring the particularly the entrapment, bring the position to the communication to the position with complaints. And I think that evaluation at least consideration of the possibility of growth hormone excess should be made in all patients with in travel neurosurgeons are interested in the what laboratory tests we should order. Could you tell us what is your laboratory investigation of a patient with acromegaly? What do you consider important in that regard? I think the problem presented to the endocrinologist or the primary physician. He's the one that the patient many times with suggestive symptoms which are by no means established, represent hard data. Most of these patients are evaluated initially on ambulatory setting and what we really need is a effective screening procedure for this. And I think that rather than send in an isolated growth hormone measurement the way most positions are inclined to do. I always give the patient in the office a mm hmm Load of 75 : 100 g of glucose. Has the patient wait quietly in the office and get growth hormone measurements at 60 and 90 minute. I think if these come back entirely normal. The chances That is below five nanograms per amount the chances of having important clinical disease? Mm hmm. Really quite remote in these patients without definitive physical things. It's important to recognize that perhaps a third of these patients do not secrete growth hormone at a continuous level but have markedly sometimes dramatically variable growth hormone levels so that the first point I would like to make is that you should not evaluate the severity of the growth from on high persecution on a single value. I think the glucose tolerance test is a useful procedure. There are certain fraction of patients who because of anxiety and stress will have elevated fasting levels, but this is rapidly suppressed by glucose administration. I should say that relatively high growth hormone conditions are not absolutely pathetic pneumonic of acrobatically, there are functional conditions associated with increased growth hormone secretion that's been observed in cirrhosis. Deliver certain patients with a. So to me, I have it in severe nutritional disturbance, patients with anorexia, nervosa have this certain disturbances associated with short stature may have high growth hormone levels so that we certainly require, mm hmm. Some evidence in the patient that has manifestations of growth hormone excess. Before we blindly accept growth hormone values. I would like to pull dr Collins more or less into this and come back to this issue of the rationale for the large number of endocrine tests that are performed in these patients. What are your opinions on this issue? Well, really, there are two issues on it. One of them is pituitary tumor, the others acromegaly and acromegaly. Usually I will see the patient what the diagnosis has already made and confirmed. But then I have needs that are different than diagnosing the patient. As a surgeon, I'd like to know how the gland functions because particularly with microsurgery, the gland, I'd like to be able to evaluate what I've done in a patient afterwards. So I'd like to know as the adrenal function. I'm gonna tell Trophic function, thyroid function. Are they normal? Are they abnormal? Do they respond? So that I think even though it isn't necessary for an exam, it does give me a feedback as to how I'm doing things. And I might say in this time, I think it also gives some protection against possible malpractice or something of this nature. If you'd like to bring it up if someone said before I was operated on, I had normal pituitary and I don't I think it's well to document it. Either both of the has been preserved or it was not there to begin with. I think another part of this is one which has been significant in my thinking about other tests that we'd be doing and the endocrine work up that is to measure anti diuretic hormone function and the reason for this has been so rare with a straight pituitary to have anything by the test we're using which is 12 hour dehydration plus exogenous, a th anti diuretic hormone given to the patient, it's been very rare for a pituitary tumor to have any functional loss in this. And when it has happened it usually signifies some extension up towards the hypothalamus or into the stock or a diagnosis that's different. So do you use this test sometimes to guide you in making a decision about further studies such as neuro diagnostic studies? Yes. I think if we find that there's inadequate anti diuretic hormone on our testing, then this has led me at least to be much more demanding of the neuro radiologist to clarify all the area around the paras ella structures the chaos and the cosmetic recess and get a good picture of the third ventricle and so forth. Dr Collins. This patient had a CT scan, did not have an arteriogram and anemones instagram. Uh He had polly tomography which you've shown is probably abnormal films. This brings up the issue of what is an appropriate neuro diagnostic work up now for the patient with acromegaly we have a tendency to use neuro radiological Diagnostic procedures for two or 3 reasons. One of them I think we've mentioned already is that if the patient has evidence of a involvement of this stalker hypothalamus by having an inadequate a th were very likely to Carefully look at the 3rd ventricle, the cosmetic recess and where we might not be in somebody else. The second is as if the technique by Newman said photography with laminar graffiti and combined. And I'm not willing to accept the computerized scan to tell me there's a difference in the sky asthmatic Recess of the 3rd ventricle or something which may be all we'll see. I don't think it's quite that fine. Now on the other hand, if there's nothing to suspect this and we have a pituitary tumor that's producing a hormone. So we know that it's a tumor of the pituitary gland, then I am. If the scan does not show any super seller or paracel extension, I will accept this. Now on our particular scanner. I might say that our previous generation scanner, I was not willing to. So we're right on the border and our tier Graham is really only done when we have an enlarged seller and we do not have a hormone that we can pick up and then we will go to the entire a group of testing including Newman cephalon graffiti. To be certain that we don't have an empty cell at this time and to be certain that we don't have a vascular lesion. Such an aneurysm that could be eroding the seller and giving us the signs of an interstellar lesion. But without any and technological signs of it or that we may not have a different type of tumor such as the meningioma or something of this nature. But to clarify this patient though in in non acromegaly. Do you normally perform an arteriogram? No, we would not perform an arteriogram on this patient. I think the only time we might have of his workups say is optimal, logical workups had shown that this left side of pain had involved also a major involvement or minor involvement of this left optic nerve or something like this. Now we might have done a new one such program, but I'm not sure this computerized scan was normal and with the erosion being at the inferior anterior portion on the left side of his palette owns, which tells you where it is. I don't think that I would have gone for a new mindset program. But now what I'm doing is I'm taking two or three facts and putting it together and and not doing a test, which is certainly not a dangerous test but an uncomfortable one. If at any point. And the information I'm pulling together says something which would such as the and or chronological ophthalmological or the x rays of the skull. Don't answer the question I'm asking. Then I would go on. Our patient had a transfer nodal, uh not hypothesis. Ectomy, but micro surgical removal of an adenoma with sparing of his gland. Yet, as you look over the, even the recent literature, you find medical treatments, you find radiation treatments. proton beam treatments, Various measures designed at treating patients with acromegaly, I would I think our audience would be most interested in just your overall philosophy. Dr Dowd a on uh your treatment of a patient with early acromegaly or advanced acromegaly. I I believe that the reasons for treating early acromegaly are probably stronger than the treatment of a difficulty uh control late acromegaly where most of the damage has been done and frequently the fire is abated to a certain extent. Early in acromegaly, mm hmm. We can present to prevent the physical disfigurement can prevent the neurologic complications. We are concerned in acromegaly about the cardiovascular complications of the disease. I think these are all very cogent arguments in terms of treatment. Well, for the I think for the benefit of our audience, I think many people realize that there are facilities where proton beam or Bragg peak radiation of Akram a gallic seems to be an appropriate therapy and I have no argument one way or the other. But let's just suppose for the sake of argument, you as an experienced endocrinologist who have dealt with this disease many years has a facility for delivering this proton beam radiation directly across the street. And you have a good neurosurgeon who can do transfer nodal surgery. Is it a fair question to ask you, what would you choose? And the majority of your early cases of acromegaly that presumably the tumors are still in the cellar. I think the verdict is not in at the present time. The major concern that Yeah, one would have about surgical treatment is in the young individual. What fraction of patients after a micro surgical procedure will be left with disturbed gonadotropin funky. There are indications that certainly not all the patients who are operated on are going to retain their gonna trope and function. Okay. I think the evidence from the centers that are doing proton beams have been are pretty well established. So it's really up to neurosurgery to show that their results in terms of continued gonadotropin function are as good as those who have been reported. Bye. The proton beam therapy. I think that's a major concern. I think both forms of therapy in the early patients with mild and moderate growth hormone excess. Both forms of therapy have been quite successful in controlling the growth hormone level dr Collins. We're talking about philosophy of treatment and I know that you have opinions on many things and I would like your opinion on this. I think that we have to get more information even on proton beam radiation as to the fact that malignant change in these patients is not going to occur. In contrast to this. I think the Uh this was a more acceptable risk as far as radiation when the only approach to this condition surgically was trans cranial craniotomy which had a significant mortality and a significant morbidity and by significant I mean five and six or 7% and in some hands as high as 10%. In contrast the micro surgical approach And I think as people have worked more with the micro surgical transfer nodal approach, this has come down almost to the mortality of anesthesia in patients who are handled medically well. And the morbidity is extremely brief so that I see no reason to accept a possible delayed morbidity in an early case of acromegaly. So I have no qualms at all of recommending strongly to a patient that the patient ought to be explored. An attempt at removal of it. I think in the late, which dr dougherty started to discuss, you have another problem because really we have two things that occur in late acromegaly or any late pituitary tumor. One of them is the mass effect and one is the endocrine apathy. And in acromegaly they don't always go together. We certainly have patients with very large tumors and relatively low but elevated growth hormones. And we have the opposite with very high growth hormones and relatively small tumors. But so to me, the in the late case, what we're after is to get the mass effect. Whether this is effect on the optic chasm or even on the brain itself or whether it's an invasive destructive effect on the base of the skull. So that could lead to gonorrhea or breakdown in the protection of the coverings of the brain to the subarachnoid space. I think this is now a question of removal of mass and treatment in this group of patients, I've very much recommend since I know the surgery in this invasive or rapidly growing tumor is not the best way of controlling it that we get the mass under control by surgical decompression and radiate them. So, on the one hand, recommending radiation, on the other hand, not recommending radiation and it really relates to the situation that you're in. Acma gallic certainly are have a relatively small percentage have a mass effect as their major problem. Uh this has been estimated in some series down around 12 or 15%. I think the most accepted is around 18 or 20%. About one in five have mass effect. In contrast to the chroma foam patient, which was extremely higher. It seems as though the emphasis or at least part of the emphasis of the discussion here has been to pick up the small tumor dr hardy has stated and has written that the ultimate diagnostic test for pituitary tumor can be considered the transmission oil exploration of the seller. Would you agree with that? Well, I think, you know, we're now operating on patients with diagnostic work up that would have passed as normal 10 years ago so that I'd have to agree in part with it. I might say that we have at least one portion of our endocrine and perhaps dr dougherty could talk about our endocrine section. Who feel that the morbidity and mortality of expiration. The cell is so low that when there's a question of diagnosis that this is worthwhile, I think the statement probably is correct, but it's rarely should be able to shouldn't have to be applied to a person or a patient. Because I think with present techniques for evaluation both from clinical laboratory and neuro radiological, there really is very rare that you have a doubt. I'm not certain that going after a one millimeter adenoma or something of this nature is is possible. Doctor Dad, I would like your comment on Dr mcclanahan question about hardy's approach and hardy statements. Well, I would agree with DR Collins. The functional diagnosis is a combined clinical and radiologic diagnosis and the I would not myself submit the patient to the operation until I was essentially certain about the diagnosis because en endocrine such as parathyroid adenomas, patriotic adenomas, we give the charge to the surgeon to operate it. They're committed to looking in the organ until they find it even to the total removal of the organ. So that I would be opposed to a view that say, well let's just go and take a quick look. I would rather spend a little more time in the diagnostic work up and saying the patient has this and so disease and you go in remove glandular tissue until you find it. I would like to ask DR Collins if you could comment on some of the technical aspects of pituitary microsurgery, particularly on the dilemma of recognizing the location of the adenoma. Once the pituitary itself has been exposed. Well, I think the the technique has been fairly well standardized with variations from the standard and our approach to the seller for instance is now does not include respecting the cartilaginous septum. That includes moving it over and just taking the mucosa off one side and going up that way. I think this has simplified two things. One is the healing process and two if we have to approach the second time, uh for some reason it allows the other side or it also allows separation of mucosa from the septum cartilaginous septum without perforation. That's really minor. I think uh in Aquaman legally at least the vast majority of them have localized erosion on their polyrhythms. And uh even on the plane skull films. And we have a tendency to go to this. I say we use two or three little tricks when you're starting. One of them consists of the fact that if you remember the blood supply of the pituitary does not come in from inferior or laterally so that when we open the dura, the covering of the cell of the door of the seller, I have a tendency to sweep the gland from that, covering all the entire inferior surface and coming up laterally quite a way up the uh sides of the gland and then do superior early until I see the diaphragm and the start just to see the diaphragmatic opening, I do this before I do anything else unless the tumor is so large that as soon as I open the dura which is you know occasionally in the necrotic large tumor will just start pouring out at you. I do this because I find that it's an easier time before any staining of the cells with blood or anything else occurs to have the definition of my dural dissection on the surface of the gland. All done. Then I have a tendency to look at the surface with irrigation and look for changes in color. And in general I think the endocrine active tumors tend to have a color which has a reddish gray Colour as compared to the more yellow pituitary. Although this is not always 100%. Some of them may actually be quite light and white and fiber optic from Probably previous bleeding or previous infarction or something. So this can be confusing just taking the one color if I don't see on the surface. And I think quite a few of them. I don't see it on the surface. I then have a tendency to split the gland and I split it with blood to section and go on down. And I used very general compression of the lateral portions of the gland where I've dissected it clear of the dura to have the tumor deliver into the uh incision in the gland. I've made let me back up on your splitting the gland. Do you split it transverse, Split it vertically. I assume that the majority of the blood supply coming down is in a sagittal plane of the of the gland. So I make my incisions actually. And if I know like in this particular patient that the Chaims are about 90% it's on the left side. I'll have a tendency to make my vertical incision About 25 or 30° off the midline towards that side. If I don't know where it is I'll have it. I think in the cushing where you so commonly find it in the middle of the gland. I will be very careful in it. The pro actions. We've had them almost everywhere. I have not had the experience that they're out laterally. The metallics have a tendency to be just where we found this one and the laterally laterally and in fairly after the treatment of these patients particularly with surgical means. Are there any problems that we experience or encounter inter chronologically in following these patients, Do you? I'm sure that you see a number of these patients post up. Are there certain problems or complications? I think we've talked about the patients who failed to be cured by. No actually unfortunately are not rare. I think we have the replacement of other hormonal deficits come up thyroid adrenal. Gonna do and the most difficult one is the Gonna tell we're gonna have a trope in replacement. I think that the patients had is disease for a long period of time, muscular weakness. Probably on the basis of irreversible neuropathy and muscular atrophy can be a particular generally, but not always a headache relieved by the procedure. I think those patients who have gone on to the stage of hypertension and LTD my cardio function may not be benefited by a late operation. You touched on an important issue that unfortunately surgeons, regardless of the skill, still have a certain incidents of patients with acromegaly not cured are in whom recurrence of an abnormal growth hormone. A curse. I really would like for both of you to uh tell our audience how this type of patient should be handled. Let's say that a man has a transfer normal operation. The tumors removed the growth hormone comes down to normal but later Rikers, what should I do? I think this brings up the subject of possible medical treatment of these patients. I don't, I myself believe that medical treatment will be a first line approach in the management of acromegaly. What sort of medical treatment? And I think that the most promising medical treatment at the present time is the use of medication similar to our Roma krypton Roma Christine is a the substance which probably acts as a dopamine type dopamine ergic type drugs. Ah in About 70% of the patients with Acromegaly. Given there will be a lowering of growth hormone levels and symptomatic improvement. They does that treat the symptoms or the tumor yet probably blocks the secretion. Oh, growth hormone directly by the tumor. That's a mechanism of action. It does not. There is at the present time no data which would suggest that it inhibits the growth of the growth hormone secreting tumors. Start his from ergo krypton available hysteria investigational drug has been extensively used in europe, particularly in Britain. The long term results are just beginning to appear. I would like to entertain questions from our audience. Uh and I would like to ask our patient if he has any questions related to his own problem or the disease in general, that he would like to ask either Dr DAO day or Dr Collins. Let me make a brief statement if I may At this point as the patient, I found this discussion particularly valuable. Many questions being answered that I didn't previously have answered not to the fault of anyone, but there is a very complex area and I think that the patient needs information and I think that people are seeing this program ought to keep in mind that the patient ultimately is the the most important if you will in terms of what you're all doing. Uh So the voluntary and overt conveying of information to the patient, particularly of his options involved here is something that the doctors could keep in mind. I'd like to thank our panelists dr DAO day and Dr Collins for taking the time today to come here and help us make this tape. I would also like to acknowledge our support of our audience and most of all the help that we had from our patients. Thank you. Mm hmm mm hmm mm hmm. Yeah. Mm hmm mm hmm. Yeah. Mm hmm mm hmm mm hmm. Yeah. Okay. Yeah.