/fee'oh kroh'moh suy toh"meuh/, n., pl. pheochromocytomas, pheochromocytomata /-meuh teuh/. Pathol.
a tumor of the sympathetic nervous system or adrenal medulla, that produces excess norepinephrine and epinephrine and causes hypertension, headaches, nausea, etc.
[1925-30; pheochromocyte a chromaffin cell of the adrenal medulla (pheochrome chromaffin ( < Gk phai(ós) dusky + -O- + -CHROME) + -O- + -CYTE) + -OMA; cf. G Phäochromocytom (1912)]

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also called  Chromaffinoma,  

      tumour, most often nonmalignant, that causes abnormally high blood pressure because of hypersecretion of the hormones epinephrine (epinephrine and norepinephrine) and norepinephrine. Usually the tumour is in the medullary cells of the adrenal gland but may occur elsewhere; e.g., in the chromaffin tissues of the ganglia of the nervous system.

      The hypertension may be persistent or paroxysmal (periodic). Patients with persistent hypertension usually are afflicted with a constant headache, are thin and nervous, and have high blood sugar and an elevated basal metabolic rate. In paroxysmal attacks of hypertension, which last from one-half to three-quarters of an hour, the headache is much more intense and is accompanied by sweating, pallor, and tremor. Surgical removal of the tumour is the most effective treatment of the disorder. Pheochromocytoma is an uncommon cause of hypertension, perhaps causing only one out of every 1,000 cases of that disorder.

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Universalium. 2010.

Look at other dictionaries:

  • Pheochromocytoma — Infobox Disease Name = Pheochromocytoma Caption = Medulla visible at bottom right. DiseasesDB = 9912 ICD10 = ICD10|C|74|1|c|73 ICD9 = ICD9|255.6 ICDO = ICDO|8700|0 OMIM = 171300 MedlinePlus = 000340 eMedicineSubj = med eMedicineTopic = 1816… …   Wikipedia

  • pheochromocytoma — noun (plural mas; also pheochromocytomata) Etymology: New Latin, from International Scientific Vocabulary pheochromocyte chromaffin cell (from pheochrome chromaffin from Greek phaios dusky, gray + International Scientific Vocabulary chrome +… …   New Collegiate Dictionary

  • pheochromocytoma — noun A neuroendocrine tumour of the medulla of the adrenal glands …   Wiktionary

  • pheochromocytoma — A functional chromaffinoma, usually benign, derived from adrenal medullary tissue cells and characterized by the secretion of catecholamines, resulting in hypertension, which may be paroxysmal and associated with attacks of palpitation …   Medical dictionary

  • pheochromocytoma — pheo·chro·mo·cy·to·ma …   English syllables

  • pheochromocytoma — Tumor that forms in the center of the adrenal gland (gland located above the kidney) that causes it to make too much adrenaline. Pheochromocytomas are usually benign (noncancerous) but can cause high blood pressure, pounding headaches, heart… …   English dictionary of cancer terms

  • pheochromocytoma — noun a vascular tumor of the adrenal gland; hypersecretion of epinephrine results in intermittent or sustained hypertension • Syn: ↑phaeochromocytoma • Hypernyms: ↑tumor, ↑tumour, ↑neoplasm …   Useful english dictionary

  • medullary chromaffinoma — pheochromocytoma …   Medical dictionary

  • medullary paraganglioma — pheochromocytoma …   Medical dictionary

  • chromaffin cell tumor — pheochromocytoma …   Medical dictionary

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