A number of other lesions should be considered in the differential diagnosis of sellar masses. Although rare, lymphocytic (i.e., autoimmune) hypophysitis should be considered in the differential diagnosis of any nonsecreting pituitary mass, especially when occurring during pregnancy or postpartum. In addition, the clinician should consider craniopharyngioma and Rathke cleft cyst in the differential diagnosis of pituitary tumors. Sellar masses may also result from tumors that are metastatic to the pituitary. This typically occurs as a part of a generalized metastatic spread and is usually associated with five or more additional metastatic sites, especially osseous; breast and lung cancer are the most common primary neoplasms metastasizing to the pituitary.
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