MR imaging findings in granular cell tumor of the neurohypophysis:: a difficult preoperative diagnosis

Granular cell tumor is a rare neoplasm arising within the neurohypophysis. We describe the MR imaging findings in two symptomatic patients. In one patient with history of panhypopituitarism, MR impurities showed a large sellar and suprasellar mass. The other patient presented with acute loss of vision in the left eye, and MR images showed a suprasellar mass with compression or the optic chiasm.