The most common mass lesion in the sella turcica is which of the following?

d. Pituitary adenoma

Pituitary adenomas are the most common mass lesions in the sella turcica or parasellar region. They constitute 8% to 10% of all brain tumors. Occasionally, they are cystic and may be confused with other lesions. Craniopharyngiomas are the next most common tumor, although these are more often suprasellar in location. These are more common in children, but up to one third occur in adults. They are usually cystic and are calcified in 70% of children and 40% of adults. More rare lesions include meningiomas, germinomas, metastatic malignancies from lung and breast primaries, gliomas, dermoids and benign epidermoid. Rathke cysts, aneurysms, and a variety of inflammatory and granulomatous processes.