Lymphocytic hypophysitis masquerading as pituitary adenoma

Introduction: Pituitary hypophysitis (PH) is characterized by pituitary infiltration of lymphocytes, macrophages, and plasma cells that could lead to loss of pituitary function. Hypophysitis may be autoimmune or secondary to systemic diseases or infections. Based on the histopathological findings PH is classified into lymphocytic, granulomatous, xanthomatous, mixed forms (lymphogranulomatous, xanthogranulomatous), necrotizing and Immunoglobulin- G4 (IgG4) plasmacytic types. Objective: To report a case of lymphocytic hypophysitis (LH). Case Report: A 15-year-old girl presented with history of headache, amenorrhea, and history of polyuria for past 4 months. Initial evaluation had suppressed follicular stimulating hormone (