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[fee-oh-kroh-moh-sahy-toh-muh] /ˌfi oʊˌkroʊ moʊ saɪˈtoʊ mə/
noun, plural pheochromocytomas, pheochromocytomata
[fee-oh-kroh-moh-sahy-toh-muh-tuh] /ˌfi oʊˌkroʊ moʊ saɪˈtoʊ mə tə/ (Show IPA).
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 (< Greek phai(ós) dusky + -o- + -chrome) + -o- + -cyte) + -oma; compare German Phäochromocytom (1912) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for pheochromocytoma
  • pheochromocytoma may occur as a single tumor or as more than one growth.
  • The test is usually done to diagnose an adrenal gland tumor called pheochromocytoma.
  • Patients with pheochromocytoma may be eligible for this study.
pheochromocytoma in Medicine

pheochromocytoma phe·o·chro·mo·cy·to·ma (fē'ō-krō'mō-sī-tō'mə)
n. pl. phe·o·chro·mo·cy·to·mas or phe·o·chro·mo·cy·to·ma·ta (-mə-tə)
A usually benign tumor of the adrenal medulla or the sympathetic nervous system in which the affected cells secrete increased amounts of epinephrine or norepinephrine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for pheochromocytoma

tumour, most often nonmalignant, that causes abnormally high blood pressure because of hypersecretion of the hormones epinephrine 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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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