noun (plural pheochromocytomas or pheochromocytomata /-ˈtōmətə/)Medicine
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.
- 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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