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pheochromocytoma Syllabification: phe·o·chro·mo·cy·to·ma
Pronunciation: /ˌfēōˌkrōməsīˈtōmə/

Definition of pheochromocytoma in English:

noun (plural pheochromocytomas or pheochromocytomata-ˈtōmətə)

A small vascular tumor of the adrenal medulla, causing irregular secretion of epinephrine and norepinephrine, leading to attacks of raised blood pressure, palpitations, and headache.
Example sentences
  • Histology, however, showed a large adenoma of the adrenal cortex; a phaeochromocytoma could not be detected.
  • Increased metabolic rate is rarely the main cause, except with an overactive thyroid or phaeochromocytoma, a rare tumour which produces excess adrenaline to stimulate our brown adipose tissue.
  • To exclude the possibility of phaeochromocytoma, case 1 underwent computed tomography and cases 3 and 4 underwent isotopic imaging.


1920s: from pheochrome, another term for chromaffin (from Greek phaios 'dusky' + khrōma 'color'), + -cyte.

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