Spindle Cell Oncocytoma of the Adenohypophysis With Marked Hypervascularity

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  • —Case Report—

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A 68-year-old male presented with a very rare case of spindle cell oncocytoma (SCO), a recently identified very rare neoplasm of the anterior pituitary, manifesting as panhypopituitarism and visual field defect. The pituitary tumor with suprasellar extension was only partially resected via transsphenoidal surgery because of the tumor consistency and bleeding. Histological diagnosis was consistent with schwannoma. The tumor regrew and angiography revealed hypervascularity, so a transcranial approach was employed for the re-operation which only achieved partial resection because of intraoperative extensive bleeding. The tumor cells showed similar histological and immunohistochemical profiles to the previous specimen, but electron microscopy demonstrated that cytoplasm abundantly filled with mitochondria. The final diagnosis of SCO was established and the patient received postoperative conventional radiation therapy of 50 Gy. Only 15 cases of SCO have been reported, and the diagnosis was mistaken in many cases as schwannoma, oncocytic pituitary adenoma, or craniopharyngioma, and multiple surgeries followed by radiation therapy were required.<br>

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