Pituicytoma

Case contributed by A.Prof Frank Gaillard

Presentation

Visual field loss.

Patient Data

Age: 55 years
Gender: Male
MRI

A very well circumscribed vividly enhancing mass is present in the suprasellar region, appearing to arise from the infundibulum, but separate from the pituitary and hypothalamus. 

The differential is primarily between an infundibular tumour (e.g. pituicytoma) and a papillary craniopharyngioma. 

Case Discussion

Patient went on to have surgery.

Histology:

MICROSCOPIC DESCRIPTION: Paraffin sections show fragments of a moderately hypercellular tumour. This is composed of a mixture of epithelioid and spindle cells with a loose fascicular and storiform arrangement. There is no significant nuclear atypia. There is prominent eosinophlic granulation of tumour cell cytoplasm. No mitotic figures or areas of necrosis are seen. 

Immunohistochemistry shows strong nuclear staining in tumour cells for TTF-1 and patchy cytoplasmic staining for epithelial membrane antigen (EMA) and S-100 protein. The features are of pituicytoma/spindle cell oncocytoma. The toposiomerase labelling index is <1%.

FINAL DIAGNOSIS: Pituicytoma/spindle cell oncocytoma

(See: Ozgur et al: Am J Surg Pathol 2013:37(11);1694-99)

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Case information

rID: 43393
Case created: 8th Mar 2016
Last edited: 13th Mar 2016
Inclusion in quiz mode: Included

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