[Primary brain lymphoma: diagnostic problems]

Diagnostic difficulties in a patient with primary malignant lymphoma of the brain are presented. Computerized tomography scans disclosed, at the beginning, a large mass located in the frontocallosal region, and 15 months later another focus in the cerebellum. Differential diagnostic considerations based on CT and NMR pictures, included infectious diseases, demyelinating diseases also metastatic tumours. The patient was successfully treated surgically, and had than radiotherapy.