Spindle cell oncocytoma of adenohypophysis: Report of a case and immunohistochemical review of literature.

We present a case of spindle cell oncocytoma (SCO) of the adenohypophysis in a 70-year-old Vietnamese male. The patient was admitted to Cho Ray Hospital after suffering from headache and visual disturbance for 6 months. Clinicians detected a 60×55×45 mm(3) mass located in the suprasellar-sellar region. Histopathologically, the resected tumor was composed of spindle cells with oncocytic appearance. Immunohistochemical examination revealed expression of anti-mitochondria antibody (AMA), vimentin, thyroid transcription factor 1 (TTF-1), epithelial membrane antigen (EMA) and galectin-3. These histologic and immunohistochemical findings are suggestive of SCO.