Asymptomatic Pheochromocytoma Associated with MEN Syndrome and Subclinical Cushing’s Syndrome

Posted on August 23, 2023 by MaryO

Abstract

Introduction and importance

Pheochromocytoma and Cushing’s syndrome are rare endocrine conditions caused by tumors in the adrenal gland. These conditions are classified under Multiple Endocrine Neoplasia (MEN) syndrome, characterized by the development of multiple tumors in the endocrine system. However, diagnosing these conditions can be challenging as they often lack clear symptoms, requiring careful evaluation, monitoring, and treatment to prevent complications.

Case presentation

A 23-year-old male recently presented with right-sided abdominal fullness and lipoma-like masses on the torso. Over a span of six months, the abdominal mass nearly doubled in size, accompanied by elevated levels of catecholamines, cortisol, parathyroid hormone (PTH), and calcitonin. Surprisingly, the patient remained asymptomatic despite these abnormal lab values. CT imaging revealed a substantial increase in the size of the mass in the right adrenal gland, from 6 × 7 cm to approximately 11.2 × 10.2 × 9 cm.

Clinical discussion

Pheochromocytoma secretes catecholamines and often leads to hypertension and related symptoms. Interestingly, most individuals with pheochromocytoma do not exhibit obvious symptoms, necessitating blood and urine tests, along with imaging studies, for accurate diagnosis. The size of the tumor does not necessarily indicate the severity of symptoms. MEN-2, a genetic syndrome, is characterized by pheochromocytoma, medullary thyroid carcinoma, and hyperparathyroidism. Additionally, methods for diagnosing Cushing’s syndrome, caused by excess cortisol production, are discussed.

Conclusion

Early diagnosis and genetic counseling are crucial in preventing complications associated with these conditions. By identifying them, appropriate treatment can be ensured for positive outcomes of patients and their families.

Keywords

Pheochromocytoma
Multiple Endocrine Neoplasia (MEN) syndrome
Cushing’s syndrome
Rare Case Report

Abbreviations

CT

computed tomography

MRI

Magnetic resonance imaging

USG

Ultrasonography

131I-MIBG

iodine 131 labeled meta-iodobenzylganidine

RAAS

Renin-angiotensin-aldosterone system

    1. Introduction

    Pheochromocytoma are catecholamine secreting tumors of chromaffin cells of adrenal medulla. It can be found anywhere in the body, with the majority being intra-abdominal and those other than adrenal medulla are referred to as paragangliomas [1,2]. Pheochromocytoma typically secretes norepinephrine and epinephrine, with norepinephrine being the primary catecholamine. However, some tumors may only secrete one of the two, and rarely, some may secrete dopamine or dopa [3].

    Vast majority >90 % of adrenal neoplasms are benign non-functional adenomas [4].About 10 % of pheochromocytomas are malignant and 10 % of cases are found on both sides. Additionally, approximately 40 % of pheochromocytomas are caused by genetic factors and can be associated with inherited syndromes [5].

    Pheochromocytoma is found to be associated with MEN-2. MEN-2 is a hereditary genetic condition that is caused by a de novo mutation in the RET gene. It is inherited in an autosomal dominant fashion and is mainly characterized by medullary thyroid carcinoma, pheochromocytoma and parathyroid adenoma or hyperplasia [6].

    MEN syndrome can be MEN-1, MEN-2A and MEN-2B. MEN-1 is characterized by pituitary tumors (prolactin or growth hormone), pancreatic endocrine tumors and parathyroid adenomas. Additionally, other tumors such as foregut carcinoids, adrenocortical adenomas, meningioma, lipomas, angiofibromas and collagenomas may also occur in MEN-1. MEN-2A is characterized by medullary thyroid carcinoma, pheochromocytoma, and parathyroid adenoma/hyperplasia; it can also be associated with cutaneous lichen amyloidosis and Hirschsprung disease. On the other hand, MEN-2B is characterized by familial medullary thyroid cancer, pheochromocytoma, mucosal neuromas, gastrointestinal tract issues, musculoskeletal and spinal problems. [7].

    Cushing syndrome results from hypercortisolism and is characterized by hypertension, weight gain, easy bruising, and central obesity [4]. Cushing’s disease refers to ACTH-dependent cortisol excess caused by a pituitary adenoma, while ACTH-independent cortisol excess due to non-pituitary causes such as excess use of glucocorticoids, adrenal adenoma, hyperplasia, or carcinoma is referred to as Cushing syndrome [8].

    This case report has been written according to the SCARE checklist [9].

    2. Case presentation

    A 23-year-old male presented to our surgery department with the chief complaint of right sided abdominal fullness for six months. According to the patient a mass was incidentally reported six months back while he was under-evaluation for mild trauma due to road traffic accident. Six months back, the mass was approximately 6 × 7 cm, while at the time of presentation to our department the mass was approximately 11.2 × 10.2 × 9 cm (CT abdomen) which was globular in shape, had regular margin, and moved with respiration. He had no history of hypertension, headache, palpitation, sweating, pallor, recent weight loss, abdominal pain, psychological disturbance, dizziness, loss of consciousness, dark color urine, burning micturition, had normal bowel and bladder habit.

    Past history and family history were insignificant. He was not under any long-term medication and no known drug allergies. He occasionally smokes and consumes alcohol.

    On physical examination at the time of presentation, multiple soft, mobile, painless, subcutaneous nodules like lipoma were present over the torso. His height was 176.8 cm, weight 68 kg, BMI 21.8 kg/m2 (body mass index). He had blood pressure of 110/70 mm of Hg taken in left arm at sitting position, heart rate of 62 beats/min, respiratory rate of 24/min, temperature of 96.6 °F, SPO2 of 98 % at right hand. A mass was palpable on the right side of abdomen, otherwise abdomen was soft, non-tender, normal bowel sound was present. Chest, cardiac and neurologic examinations were all normal.

    Initial laboratory evaluation revealed 24 h. urine metanephrine of 5415 μg/24 h (normal: 25–312 μg/24 h.); 24 h. urine VMA of 32.2 mg/24 h. (normal: <13.60 mg/24 h.); serum cortisol of 535.16 nmol/l after overnight low dose dexamethasone(1 mg) suppression test (normal: <50 nmol/l);24 h. Urine free cortisol of 526.61 nmol/24 h. (normal: 30–145 nmol/24 h) PTH(intact) of 89.2 pg./ml (normal: 15–65 pg./ml); serum calcitonin of 15.2 pg./ml (normal: ≤8.4 pg./ml); serum CEA of 4.72 ng/ml (normal: 0.0–4.4 ng/ml); serum DHEA of 1.19 ng/ml (normal: 1.7–6.1 ng/ml). Baseline investigation: Hematology, urine routine/microscopic, electrolytes were within the normal range.

    Additional laboratory findings were as in the Table 1.

    Table 1.

    Lab evaluation Result Reference Unit
    Metanephrine, urine 24 h 5415 25–312 μg/24 h
    VMA, urine 24 h 32.2 <13.60 mg/24 h
    VMA, urine 12.88 – ng/l
    Cortisol, serum, overnight DST 535.16 <50 nmol/l
    Cortisol, urine 24 h 526.61 30–145 nmol/24 h
    ACTH, complete 28.3 7.2–63.3 pg/ml
    DHEA, serum 1.19 1.7–6.1 ng/ml
    CEA, serum 4.72 0.0–4.4 ng/ml
    Phosphorus, serum 3.0 2.5–4.5 mg/dl
    Albumin, serum 5.2 3.5–5.2 g/dl
    Calcitonin, serum 15.2 ≤8.4 pg/ml
    Calcium, serum 8.94 8.6–10.0 mg/dl
    PTH (intact) 89.2 15–65 pg/ml
    aldosterone 8.7 7.0–30 g/dl
    Plasma rennin activity 1.42 0.10–6.56 ng/ml/h
    Aldosterone-rennin ratio 6.13 ≤20
    Creatinine, urine 36 – mg/dl

    DST – dexamethasone suppression test; VMA – vanilmandelic acid; ACTH – adrenocorticotropic hormone; DHEA – dehydroepiandrosterone; CEA – carcino-embryonic-antigen; PTH – parathyroid hormone.

    2.1. USG abdomen

    USG abdomen (Fig. 1, Fig. 2) showed well defined mixed echoic area in Right adrenal region measuring 12.7 × 10.7 cm in size. There was presence of internal vascularity with multiple foci of cystic compound. The lesion displaced the right kidney inferiorly.

    Fig. 1

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    Fig. 1. USG abdomen.

    Fig. 2

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    Fig. 2. USG abdomen.

    2.2. Plane and contrast CT scan of abdomen

    Plane and contrast CT scan of Abdomen (Fig. 3) showed approximately 11.2 × 10.2 × 9 cm sized, relatively well defined heterogeneous soft tissue density lesion with well-defined enhancing wall in right adrenal region. Non-enhancing areas were noted within the mass suggestive of necrosis. Few calcific foci were noted within the mass with no obvious hemorrhagic component. The lesion showed heterogeneous enhancement post contrast image.

    Fig. 3

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    Fig. 3. CT abdomen.

    After all the workup patient was given diagnosis of right sided Pheochromocytoma associated with MEN syndrome, with ACTH-independent Cushing’s syndrome and right adrenalectomy was performed.

    2.3. Pathology report

    2.3.1. Gross descriptions

    The specimen was globular mass measuring 14.5 × 10 cm, with smooth outer surface. On sectioning, the mass was well circumscribed, soft and yellow-brown, predominantly solid with cyst formation. The size of cyst ranges from 0.3 to 3.5 cm in diameter. Areas of hemorrhages were noted.

    2.3.2. Microscopic description

    Section showed tumor cells arranged in well-defined nests (Zellballen), alveolar and diffuse pattern with intervening fibrovascular stroma. The cells were intermediate to large sized, polygonal with finely granular amphophilic cytoplasm. The nuclei showed mild to moderate pleomorphism and were round to ovoid, with prominent nuclei noted. No capsular invasion, vascular invasion and necrosis. Areas of hemorrhage were seen. Mitosis 0–1/10 high power field was noted (Figs. 4 and 5).

    Unlabelled Image

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    Fig.a Diffuse Zellbalen pattern with intervening fibrous stroma.

    Fig.b Mild to moderate pleomorphic nuclei with abundant hemorrhage.

    Fig.c Low power field with intact capsule.

    Figs. 4 and 5

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    Figs. 4 and 5. Fig. 4 Intra-operative resection of tumor; Fig. 5 tumor after resection.

    3. Discussion

    In Pheochromocytoma activation of the alpha-one adrenergic receptor by catecholamine in the vascular bed causes vasoconstriction and leads to a rise in blood pressure. Similarly, activation of the beta-one receptor in the heart enhances the chronotropic and inotropic effect of the myocardium, leading to an increase in heart rate and cardiac output. In addition, activation of the beta-one receptor in the juxtaglomerular cells of the kidney activates the RAAS system. These receptor activation result in cardiovascular and sympathetic changes, such as hypertension, palpitation, headache, sweating, trembling, and anxiety [10].

    In Pheochromocytoma, the patient may have a 10-fold increase in plasma catecholamines, but the hemodynamic response can still fall within the normal range due to desensitization of the cardiovascular system. When catecholamine levels are elevated for a prolonged period, the alpha-one receptors in blood vessels may be down-regulated, making norepinephrine unresponsive in raising peripheral vascular resistance, which can lead to normal blood pressure. Similarly, a marked decrease in beta-one receptors in the heart could explain the normal heart rate, which was observed in our asymptomatic patient with Pheochromocytoma [11].

    Sometimes in asymptomatic patients, the size of the tumor tends to be larger than in those with hyperfunctioning tumors [12]. However, medical interventions such as surgery, anesthesia induction, intravenous urography contrast, or manipulation of the tumor can trigger adrenergic and hypertensive crises, so biopsy is usually contraindicated in pheochromocytoma [13].

    The diagnosis of pheochromocytoma is typically based on measuring plasma and urinary levels of catecholamines and their derivatives such as metanephrine and vanillylmandelic acid. The most reliable test is the measurement of urinary metanephrine as its excretion levels are relatively higher [13,14]. The combination of 131I-MIBG scintigraphy along with diagnostic urinary and blood tests can further enhance the sensitivity of the test. Specifically, the urinary normetanephrine test is considered the most sensitive single test for detecting Pheochromocytoma [15,16].

    In addition to a 24-h urine test and blood test, if the lab results are positive for Pheochromocytoma or paragangliomas, further diagnostic tests may be recommended, such as a CT scan, MRI, m-iodobenzylganidine (MIBG) imaging, or positron emission tomography (PET) [16,17]. In our patient 24 h. urine metanephrine of 5415 μg/24 h (normal: 25–312 μg/24 h.); 24 h. urine VMA of 32.2 mg/24 h. (normal: <13.60 mg/24 h.) and imaging confirmation of right adrenal mass lead to the diagnosis of right sided pheochromocytoma.

    Our patient with pheochromocytoma was tested for parathyroid hormone and calcitonin due to the association of pheochromocytoma with MEN-2 [18]. MEN-2 can be diagnosed biochemically by measuring the baseline levels of calcitonin, parathyroid hormone and serum calcium along with blood tests for catecholamines and their metabolites to detect pheochromocytoma [19]. In our patient, multiple soft, mobile, painless, subcutaneous nodules like lipoma were present over the torso(MEN-1) and high levels of parathyroid hormone and calcitonin were detected(MEN-2). These findings can be correlated with MEN syndrome.

    USG of the neck revealed no abnormalities of thyroid and parathyroid gland in our patient so prophylactic thyroidectomy was not done, instead he was counseled for follow up if any symptoms or thyroid swelling appears.

    The diagnosis of Cushing’s syndrome typically involves measuring the levels of 24-h urine free cortisol and assessing the suppression of cortisol in response to a 1 mg overnight dexamethasone test. If cortisol levels remain elevated despite the test, the next step is to measure serum ACTH levels. If ACTH levels are suppressed, it suggests an ACTH-independent cause of Cushing’s syndrome, while elevated ACTH levels suggest an ACTH-dependent cause. Further evaluation may include a CT scan of the chest, abdomen, and pelvis to identify potential ectopic sources, as well as an MRI of the pituitary gland [8]. Our patient had a high level of 24 h. urine free cortisol of 526.61 nmol/24 h (reference range: 30–145 nmol/24 h) and serum cortisol of 535.16 nmol/L(reference range: <50 nmol/L) after overnight 1 mg dexamethasone suppression test, but normal level of ACTH of 28.3 pg./ml (reference range: 7.2–63.1 ng/ml), this suggests the diagnosis of ACTH independent Cushing’s syndrome.

    4. Conclusion

    Large Pheochromocytoma patients can be asymptomatic and can present in association with other endocrine disorders. So proper evaluation is necessary to find out associated conditions and manage accordingly to prevent the possible outcomes.

    Patient consent

    Written, informed consent was obtained from the patient for the publication of the report.

    Ethical approval

    It is exempted at my institution. We don’t need to take approval from ethical committee for case report.

    Funding

    N/A.

    Author contribution

    Conceptualization: Sanjit Kumar Shah.

    Clinical diagnosis and patient management: Mahipendra Tiwari.

    Microscopic slide preparation: Sneh Acharya.

    Writing original draft: Sanjit Kumar Shah and Avish Shah.

    All authors were involved in reviewing, editing, supervision and in preparing the final

    manuscript.

    Guarantor

    Guarantor: Sanjit Kumar Shah

    Email: sanjitshah023@gmail.com

    Conflict of interest statement

    N/A.

    References

    Filed under: adrenal, Cushing's, Rare Diseases, symptoms | Tagged: , , , | Leave a comment »

    Hormonal Imbalance – Indication of Pituitary Gland Tumors

    Posted on March 6, 2019 by MaryO

    Patna: Improper functioning of the Pituitary gland usually results in excess or under production of hormones that leads to a formation of mass called tumor, which can be benign or malignant. Such tumors in this gland can create numerous serious medical conditions by interfering with the normal functioning of the endocrine system and pituitary gland.

     

    “Though the occurrence of tumor is more likely after the age of 30 years, it still can impact at an early age. The survival rates of tumor due to its complicated location also depend on other factors like the patient’s age, type and size of tumor. Mostly, pituitary gland tumors are non cancerous but the exact causes are unknown. Some of them are hereditary and some are caused by a rare genetic disorder called as multiple endocrine neoplasia type 1. This disorder can also lead to over-activity or enlargement of 3 different endocrine-related glands, which also includes the pituitary gland. “Dr Aditya Gupta, Director, Neurosurgery, Agrim institute for neuro sciences, Artemis Hospital

     

    Diagnosis at an early stage can help the treatment procedure to be totally non-invasive with the use of advances technology called as Cyberknife. Cyberknife which is the most advanced radiation therapy is completely non-invasive therapy available for the treatment of benign as well as malignant tumors. This therapy works the best for some pituitary tumors that are upto 2 cm in size and is a very powerful and effective technique for treating patients suffering from early stage primary and medically inoperable tumors. The treatment is safe to administer and also offers a new option in patients with recurrent disease or a single disease in the body.

     

    “Highlights of the therapy being ease of access to any complex location without the need to use the surgical knife, precision of the beam with high dose radiation to the tumor location, and the safety. It is a day care procedure without pain and risk, and the patient can get back to daily chores as soon as the session gets over which depends on the tumor typically (30 minutes) and hence eliminates the requirement of any hospital stay.” Added Dr Gupta

     

    Depending upon the hormonal variations in the body, there can be a variety of symptoms. The most common symptoms include Headaches, vision problem, tiredness, mood changes, irritability, changes in menstrual cycle in women, impotence, infertility, Inappropriate breast growth or production of breast milk, Cushing’s syndrome which is a combination of weight gain, high blood pressure, diabetes, and easy bruising, the enlargement of the extremities or limbs, thickening of the skull and jaw caused by too much growth hormone.

     

    Pituitary gland, which is also known as the master gland has the most important function of producing hormones that regulates the critical organs of the body including thyroid, adrenal glands, ovaries and testes. It is a small pea-size gland located behind the eyes and below the front of the brain. Some tumors produce hormones known as functional tumors, and others can cause the glands to secrete too few or too many hormones. Also if the tumor pressed on the nearby structure, for instance the optic nerve, can also limit a person’s vision.

     

    Moreover the procedure makes use of the most sophisticated image guidance technique to focus high doses of radiation directly to the tumor spot which eliminates the chances to damage the healthy cells as in any other methods of treatment.

     

    “Each session of treatment usually lasts for about 30 -50 min and is cost effective with a success rate of 98% in such complicated tumors. Patients with pituitary adenomas receive stereotactic radio surgery with CyberKnife and are followed up for more than 12 months. After 2-3 weeks of therapy patients are monitored for positive responses and ensure there is no recurrence of any mass. Stereotactic radio surgery with the CyberKnife is effective and safe against pituitary adenomas.” Said Dr Gupta

    From https://www.apnnews.com/hormonal-imbalance-indication-of-pituitary-gland-tumors-2/

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    What Genes are Related to Cushing’s Disease?

    Posted on July 29, 2015 by MaryO

    genetic

     

    The genetic cause of Cushing disease is often unknown. In only a few instances, mutations in certain genes have been found to lead to Cushing disease. These genetic changes are called somatic mutations. They are acquired during a person’s lifetime and are present only in certain cells. The genes involved often play a role in regulating the activity of hormones.

    Cushing disease is caused by an increase in the hormone cortisol, which helps maintain blood sugar levels, protects the body from stress, and stops (suppresses) inflammation. Cortisol is produced by the adrenal glands, which are small glands located at the top of each kidney. The production of cortisol is triggered by the release of a hormone called adrenocorticotropic hormone (ACTH) from the pituitary gland, located at the base of the brain. The adrenal and pituitary glands are part of the hormone-producing (endocrine) system in the body that regulates development, metabolism, mood, and many other processes.

    Cushing disease occurs when a noncancerous (benign) tumor called an adenoma forms in the pituitary gland, causing excessive release of ACTH and, subsequently, elevated production of cortisol. Prolonged exposure to increased cortisol levels results in the signs and symptoms of Cushing disease: changes to the amount and distribution of body fat, decreased muscle mass leading to weakness and reduced stamina, thinning skin causing stretch marks and easy bruising, thinning of the bones resulting in osteoporosis, increased blood pressure, impaired regulation of blood sugar leading to diabetes, a weakened immune system, neurological problems, irregular menstruation in women, and slow growth in children. The overactive adrenal glands that produce cortisol may also produce increased amounts of male sex hormones (androgens), leading to hirsutism in females. The effect of the excess androgens on males is unclear.

    Most often, Cushing disease occurs alone, but rarely, it appears as a symptom of genetic syndromes that have pituitary adenomas as a feature, such as multiple endocrine neoplasia type 1 (MEN1) or familial isolated pituitary adenoma (FIPA).

    Cushing disease is a subset of a larger condition called Cushing syndrome, which results when cortisol levels are increased by one of a number of possible causes. Sometimes adenomas that occur in organs or tissues other than the pituitary gland, such as adrenal gland adenomas, can also increase cortisol production, causing Cushing syndrome. Certain prescription drugs can result in an increase in cortisol production and lead to Cushing syndrome. Sometimes prolonged periods of stress or depression can cause an increase in cortisol levels; when this occurs, the condition is known as pseudo-Cushing syndrome. Not accounting for increases in cortisol due to prescription drugs, pituitary adenomas cause the vast majority of Cushing syndrome in adults and children.

    Read more about familial isolated pituitary adenoma.

     

    How do people inherit Cushing disease?

    Most cases of Cushing disease are sporadic, which means they occur in people with no history of the disorder in their family. Rarely, the condition has been reported to run in families; however, it does not have a clear pattern of inheritance.

    The various syndromes that have Cushing disease as a feature can have different inheritance patterns. Most of these disorders are inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder.

    From http://ghr.nlm.nih.gov/condition/cushing-disease

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    Cushing’s Awareness Challenge 17

    Posted on April 17, 2014 by MaryO

    robin-causes

    Another of Robin’s wonderful images.

    A similar image from the CushieWiki

    cushings-causes

    No wonder Cushing’s is so hard to diagnose!

    maryo colorful zebra

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    Could you Shed Some Light on Cushing’s Disease?

    Posted on April 14, 2014 by MaryO

    Dear Dr. Roach: Could you shed some light on Cushing’s disease? Four people in the same family have it. The doctors say it has something to do with the thyroid gland.

    — Anon.

    A: Cushing’s syndrome, which is different from Cushing’s disease, is an excess of cortisone or similar corticosteroids. It can be caused by taking too much steroid for too long, usually as treatment for a serious medical condition. Cushing’s disease is a special case of Cushing’s syndrome, when the excess cortisone is caused by a tumor in the pituitary gland, which spurs the adrenal gland to make excess amounts of hormone. Weight gain, almost exclusively in the abdomen, a striking round “moon” face, a fat pad on the back of the neck and upper back (“buffalo hump”), diabetes, pigmented stretch marks and high blood pressure are common findings in any form of Cushing’s syndrome.

    It is very unusual for Cushing’s disease to run in families. Also, it does not affect the thyroid, although thyroid conditions can sometimes mimic Cushing’s (and vice versa). I suspect that what this might be is a rare condition called multiple endocrine neoplasia type I (MEN-1). This does run in families, and combines risk for pituitary, parathyroid and pancreatic islet cell tumors. (The parathyroid glands sit on top of the thyroid gland and secrete parathyroid hormone, responsible for calcium metabolism. The pancreatic islet cells are where insulin is made.) Not everybody with MEN-1 will have tumors in all of these glands. Parathyroid tumors are the most common.

    An endocrinologist is the expert in Cushing’s and the MEN syndromes.

    ​Dr. Keith Roach writes for North America Syndicate. Send letters to Box 536475, Orlando, FL 32853-6475 or email ToYourGoodHealth@med.cornell.edu.

    From http://herald-review.com/news/opinion/editorial/columnists/roach/dr-keith-roach-teeth-grinding-is-common-in-the-elderly/article_bef63ba4-9b5e-5bff-b66a-3530be158857.html

    Filed under: adrenal, Cushing's, pituitary, Rare Diseases | Tagged: , , , , , , , , , , , , , , , , , , , , , , | Leave a comment »

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