CASE REPORTS
JOURNAL ARTICLE
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Case report: Primary pituitary non-Hodgkin's lymphoma developed following surgery and radiation of a pituitary macroadenoma.

OBJECTIVE: Primary central nervous system (CNS) non-Hodgkin's lymphoma is a rarely encountered clinical entity. Here we present a case of a primary CNS diffuse large B-cell non-Hodgkin's lymphoma developed on a previously operated and irradiated pituitary macroadenoma. DESIGN-RESULTS: A 60-year-old woman presented with muscle weakness and eye lid ptosis. Thirty years ago, she was diagnosed with a non-functioning pituitary macroadenoma requiring repeated incomplete operations and conventional radiotherapy and accompanied by partial anterior pituitary deficiency. On admission, the magnetic resonance imaging (MRI) identified a pituitary sellar mass extending into the suprasellar region, compressing the optic chiasm and invading the left cavernous sinus. Following transsphenoidal surgery, the histological investigation revealed the presence of a diffuse large B-cell non-Hodgkin's lymphoma without other loci from the systemic staging. Following chemotherapy and despite a marked resolution of the neoplastic pituitary mass in the post-chemotherapy MRI scan, the patient's course was complicated with consciousness deterioration attributed to epileptic seizures and she died of a hospital acquired infection.

CONCLUSIONS: Clinicians should include primary CNS lymphoma in the differential diagnosis of an isolated invasive sellar mass. The possible association of primary CNS lymphoma development with the history of operated and irradiated pituitary adenoma is herein discussed.

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