null-cell adenomamedical dictionary

<tumour>

An adenoma of the hypophysis composed of cells for which there is no overt evidence or hormone production, but which usually produces hypopituitarism and visual disturbances by compression of adjacent structures; approximately one third of these tumours have cells with abundant mitochondria (oncocytes) that are somewhat larger than the monocytic null cells.

Synonyms: undifferentiated cell adenoma.

(05 Mar 2000)

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