Idiopathic giant cell granuloma in the saddle area recurring soon after subtotal resection: a case report.

Giant cell granuloma is non-neoplastic proliferation of multinucleated giant cells and rarely occurs in the intracranial space. Here we report a 40-year-old man presented with left ptosis and impaired vision. Magnetic resonance imaging revealed a mass extending from the intrasellar area to the third ventricular floor, left cavernous sinus, retrochiasmatic area, and the left interpeduncular cistern. The lesion was subtotally resected using the transsphenoidal approach. Three months after the operation, the mass recurred and hormone levels decreased significantly. Radiotherapy and steroid therapy were administered at this time.