Cerebral lymphoma presenting as a leukoencephalopathy.

Cerebral lymphoma is infrequent in immunocompetent patients. This tumour usually appears on CT and MRI as a single lesion or as multiple lesions with mass effect and homogeneous enhancement after contrast administration. A patient is described with a cerebral lymphoma, confirmed by histopathological examination, who presented as a progressive leukoencephalopathy.