Multiple recurrences of spindle cell oncocytoma: A case report and literature review.

Spindle cell oncocytoma (SCO) is a rare tumor originating from pituicytes of the neurohypophysis. It typically occurs in the adult population between 50 and 60 years of age and is often misdiagnosed preoperatively as pituitary adenoma because of similar clinical presentation and neuroimaging features. Diffuse nuclear immunoreactivity for TTF-1 (also known as NK2 homeobox 1 factor) is characteristic of SCO and other tumors of the posterior pituitary. We report a case of SCO in a patient who underwent multiple surgical resections for recurrence. The aim of this case report and literature review is to provide an overview of what is currently known about SCO as well as raise the awareness of this entity to endocrinologists, neurologists, neurosurgeons, and neuropathologists. Our case is also unusual in that the tumor displayed immunoreactivity for neuronal markers, which is a very rare occurrence.