Objective:To explore the clinical pathological features,diagnosis and differential diagnosis of primary central nervous system diffuse large B cell lymphoma.Methods:The clinical data,histological pathological morphology and immunohistochemical results of 12 patients with primary central nervous system diffuse large B cell lymphoma were retrospectively analyzed.Results:The average age of 12 patients was 53.2 years.Visible tumor cells showed diffuse invasive distribution under light microscope,there was no bo...