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Spindle cell oncocytoma of the adenohypophysis is a rare tumour recently reported by Roncaroli  et al.  in 2002. This tumour is considered a grade I tumour by the World Health Organization.    Case presentation  We describe what is, to the best of our knowledge, the 14th case of its kind in the literature. A 45-year-old African woman presented clinical and radiological findings related to a nonfunctioning pituitary adenoma. The diagnosis was made on the basis of histological and immunohistochemical findings.    Conclusion  The purpose of this work is to report a rare pituitary tumour and to describe its histological and immunohistochemical features, which were characterized by the expression of thyroid transcription factor 1 antigen by tumour cells. This fact could support the theory of a possible common origin of these tumours in pituicytomas. In fact, thyroid transcription factor 1 is considered to be a specific marker of pituicytes.

Spindle cell oncocytoma of the adenohypophysis in a woman: a case report and review of the literature