Granular cell tumor of the neurohypophysis: a single-institution experience.

Granular cell tumor (GCT) is a rare neoplasm occurring in the sellar and suprasellar spaces. It is a primary tumor of the neurohypophysis, presumably arising from the pituicytes, a distinctive glial cell of the neurohypophysis. GCTs in most reported cases show biologically benign behavior with slow growth. Only 70 cases of hypophyseal GCTs have been reported in the literature. We report a case of GCT in the neurohypophysis of a 46-year-old woman and discuss the histological and clinical features of this neoplasm together with the treatment modalities, reviewing the pertinent literature.