Primary cerebral lymphoma presenting with cranial diabetes insipidus.

A 30 year old woman with an 8-year history of thirst and polyuria was found to have cranial diabetes insipidus. There were no neurological abnormalities at presentation but she subsequently developed diverse signs and died 26 months later. Autopsy revealed a diagnosis of diffuse primary cerebral lymphoma. Cranial diabetes insipidus with otherwise minimal abnormality of hypothalamic/pituitary function has not previously been reported as a presentation of this neoplasm.