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Found 2 results

  1. By: SHERRY BOSCHERT, Family Practice News Digital Network SAN FRANCISCO – The size of a pituitary tumor on magnetic resonance imaging in a patient with ACTH-dependent Cushing’s syndrome can’t differentiate between etiologies, but combining that information with biochemical test results could help avoid costly and difficult inferior petrosal sinus sampling in some patients, a study of 131 cases suggests. If MRI shows a pituitary tumor larger than 6 mm in size, the finding is 40% sensitive and 96% specific for a diagnosis of Cushing’s disease as the cause of adrenocorticotropic hormone (ACTH)-dependent Cushing’s syndrome, and additional information from biochemical testing may help further differentiate this from ectopic ACTH secretion, Dr. Divya Yogi-Morren and her associates reported at the Endocrine Society’s Annual Meeting. Pituitary tumors were seen on MRI in 6 of 26 patients with ectopic ACTH secretion (23%) and 73 of 105 patients with Cushing’s disease (69%), with mean measurements of 4.5 mm in the ectopic ACTH secretion group and 8 mm in the Cushing’s disease group. All but one tumor in the ectopic ACTH secretion group were 6 mm or smaller in diameter, but one was 14 mm. Because pituitary "incidentalomas" as large as 14 mm can be seen in patients with ectopic ACTH secretion, the presence of a pituitary tumor can’t definitively discriminate between ectopic ACTH secretion and Cushing’s disease, said Dr. Yogi-Morren, a fellow at the Cleveland Clinic. That finding contradicts part of a 2003 consensus statement that said the presence of a focal pituitary lesion larger than 6 mm on MRI could provide a definitive diagnosis of Cushing’s disease, with no further evaluation needed in patients who have a classic clinical presentation and dynamic biochemical testing results that are compatible with a pituitary etiology (J. Clin. Endocrinol. Metab. 2003;88:5593-602). The 6-mm cutoff, said Dr. Yogi-Morren, came from an earlier study reporting that 10% of 100 normal, healthy adults had focal pituitary abnormalities on MRI ranging from 3 to 6 mm in diameter that were consistent with a diagnosis of asymptomatic pituitary adenomas (Ann. Intern. Med. 1994;120:817-20). A traditional workup of a patient with ACTH-dependent Cushing’s syndrome might include a clinical history, biochemical testing, neuroimaging, and an inferior petrosal sinus sampling (IPSS). Biochemical testing typically includes tests for hypokalemia, measurement of cortisol and ACTH levels, a high-dose dexamethasone suppression test, and a corticotropin-releasing hormone (CRH) stimulation test. Although IPSS is the gold standard for differentiating between the two etiologies, it is expensive and technically difficult, especially in institutions that don’t regularly do the procedure, so it would be desirable to avoid IPSS if it’s not needed in a subset of patients, Dr. Yogi-Morren said. The investigators reviewed charts from two centers (the Cleveland Clinic and the M.D. Anderson Cancer Center, Houston) for patients with ACTH-dependent Cushing’s syndrome seen during 2000-2012. ACTH levels were significantly different between groups, averaging 162 pg/mL (range, 58-671 pg/mL) in patients with ectopic ACTH secretion, compared with a mean 71 pg/mL in patients with Cushing’s disease (range, 16-209 pg/mL), she reported. Although there was some overlap between groups in the range of ACTH levels, all patients with an ACTH level higher than 210 pg/mL had ectopic ACTH secretion. Median serum potassium levels at baseline were 2.9 mmol/L in the ectopic ACTH secretion group and 3.8 mmol/L in the Cushing’s disease group, a significant difference. Again, there was some overlap between groups in the range of potassium levels, but all patients with a baseline potassium level lower than 2.7 mmol/L had ectopic ACTH secretion, she said. Among patients who underwent a high-dose dexamethasone suppression test, cortisol levels decreased by less than 50% in 88% of patients with ectopic ACTH secretion and in 26% of patients with Cushing’s disease. Most patients did not undergo a standardized, formal CRH stimulation test, so investigators extracted the ACTH response to CRH in peripheral plasma during the IPSS test. As expected, they found a significantly higher percent increase in ACTH in response to CRH during IPSS in the Cushing’s disease group, ranging up to more than a 1,000% increase. In the ectopic ACTH secretion group, 40% of patients did have an ACTH increase greater than 50%, ranging as high as a 200%-300% increase in ACTH in a couple of patients. "Although there was some overlap in the biochemical testing, it is possible that it provides some additional proof to differentiate between ectopic ACTH secretion and Cushing’s disease," Dr. Yogi-Morren said. In the ectopic ACTH secretion group, the source of the secretion remained occult in seven patients. The most common identifiable cause was a bronchial carcinoid tumor, in six patients. Three patients each had small cell lung cancer, a thymic carcinoid tumor, or a pancreatic neuroendocrine tumor. One patient each had a bladder neuroendocrine tumor, ovarian endometrioid cancer, medullary thyroid cancer, or a metastatic neuroendocrine tumor from an unknown primary cancer. The ectopic ACTH secretion group had a median age of 41 years and was 63% female. The Cushing’s disease group had a median age of 46 years and was 76% female. Dr. Yogi-Morren reported having no financial disclosures. sboschert@frontlinemedcom.com On Twitter @sherryboschert From Famiiy Practice News
  2. October 1, 2012 at 6:30 PM eastern, Dr. Amir Hamrahian will answer our questions about Cushing's, pituitary or adrenal issues and Korlym (mifepristone) in BlogTalkRadio at http://www.blogtalkr...s-our-questions You may listen live at the link above. The episode will be added to the Cushing's Help podcast after the show is over. Listen to the podcasts by searching for Cushings in the iTunes podcast area or click here: http://itunes.apple....ats/id350591438 Dr. Hamrahian has had patients on Korlym for about 4 years. Please submit your questions below or email them to CushingsHelp@gmail.com before Sunday, September 30. From Dr. Hamrahian's bio at http://my.clevelandc...x?doctorid=3676 Amir Hamrahian, M.D. (216) 444-6568 http://my.clevelandc...5&DoctorID=3676 Appointed: 2000 Request an Appointment Research & Publications † ( † Disclaimer: This search is powered by PubMed, a service of the U.S. National Library of Medicine. PubMed is a third-party website with no affiliation with Cleveland Clinic.) Biographical Sketch Amir H. Hamrahian, MD, is a Staff member in the Department of Endocrinology, Diabetes and Metabolism at Cleveland Clinic's main campus, having accepted that appointment in 2005. Prior to that appointment, he was also a clinical associate there for nearly five years. His clinical interests include pituitary and adrenal disorders. Dr. Hamrahian received his medical degree from Hacettepe University in Ankara, Turkey, and upon graduation was a general practitioner in the provinces of Hamadan and Tehran, Iran. He completed an internal medicine residency at the University of North Dakota, Fargo, and an endocrinology fellowship at Case Western Reserve University and University Hospitals, Cleveland. In 2003, he received the Teacher of the Year award from Cleveland Clinic's Department of Endocrinology, Diabetes and Metabolism. Dr. Hamrahian speaks three languages -- English, Turkish and Farsi -- and is board-certified in internal medicine as well as endocrinology, diabetes and metabolism. He is a member of the Endocrine Society, Pituitary Society and the American Association of Clinical Endocrinologists. Education & Fellowships Fellowship - University Hospitals of Cleveland Endocrinology Cleveland, OH USA 2000 Residency - University of North Dakota Hospital Internal Medicine Fargo, ND USA 1997 Medical School - Hacettepe University School of Medicine Ankara Turkey 1991 Certifications Internal Medicine Internal Medicine- Endocrinology, Diabetes & Metabolism Specialty Interests Cushing syndrome, acromegaly, pheochromocytoma, prolactinoma, primary aldosteronism, pituitary disorders, adrenal tumor, adrenocortical carcinoma, MEN syndromes, adrenal disorders Awards & Honors Best Doctors in America, 2007-2008 Memberships Pituitary Society Endocrine Society American Association of Clinical Endocrinologists American Medical Association Treatment & Services Radioactive Iodine Treatment Thyroid Aspiration Thyroid Ultrasound Specialty in Diseases and Conditions Acromegaly Addison’s Disease Adrenal disorders Adrenal insufficiency Adrenal Insufficiency and Addison’s Disease Adrenal Tumors Adrenocortical Carcinoma Adrenoleukodystrophy (ALD) Amenorrhea Androgen Deficiency (Low Testosterone) Androgen Excess Calcium Disorders Carcinoid Syndrome Conn's Syndrome Cushing's Syndrome Empty sella Erectile Dysfunction Familial Multiple Endocrine Neoplasia Fasting hypoglycemia Flushing Syndromes Galactorrhea Goiter Growth hormone deficiency Growth hormone excess Gynecomastia Hirsutism Hyperaldosteronism Hyperandrogenism Hyperprolactinemia Hypertension - High Blood Pressure Hyperthyroidism Hypocalcemia Hypoglycemia Hypogonadism Hypoparathyroidism Hypophysitis Hypopituitarism Hypothyroidism Mastocytosis Menopause, Male Menstrual Disorders Paget's Disease Panhypopituitarism Parathyroid Cancer Parathyroid Disease and Calcium Disorders Pheochromocytoma Pituitary Cysts Pituitary Disorders Pituitary stalk lesions Pituitary Tumors Premenstrual Syndrome (PMS) Primary Hyperaldosteronism Primary Hyperparathyroidism Prolactin Excess States Prolactinoma Thyroid and pregnancy Thyroid Cancer Thyroid Disease Thyroid Nodule
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