Primary non-Hodgkin lymphoma of the chiasm and optic tract in a nonimmunocompromised patient: illustrative case.

Background: Chiasmatic and optic track lymphoma as the primary lesion of the central nervous system (CNS) is extremely rare.

Observations: The authors report a case of a previously healthy 62-year-old woman who presented with quick and progressive visual impairment leading to bilateral blindness. Brain imaging studies suggested glioma or lymphoma of the chiasm and the posterior visual pathway. Postoperative examination revealed low-grade malignant B-cell lymphoma. No evidence of extracranial lymphoma was found, so a final diagnosis of primary CNS lymphoma (PCNSL) was made.

Lessons: To the authors' knowledge, PCNSL confined to the optic chiasm has rarely been reported in nonimmunocompromised patients. The present case of lymphoma affecting the optic chiasm and optic tract is extremely rare.