RT Journal Article SR Electronic T1 Progressive leukoencephalopathy caused by primary CNS lymphoma JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 359 OP 361 DO 10.1136/jcp.2009.072082 VO 63 IS 4 A1 Matošević, Benjamin A1 Knoflach, Michael A1 Furtner, Martin A1 Gotwald, Thaddäus A1 Maier, Hans A1 Kiechl, Stefan A1 Willeit, Johann YR 2010 UL http://jcp.bmj.com/content/63/4/359.abstract AB Prominent leukoaraiosis is common in the clinical routine setting. In addition to microatheroma and hypertensive small vessel disease (lipohyalinosis), a large number of rare but clinically relevant differential diagnoses have to be considered. A man in his 60s presented with left pontine infarction and subsequent rapidly deteriorating leukoaraiosis associated with dementia. Standard non-invasive examination did not enable the correct diagnosis to be obtained. A brain biopsy sample revealed a combination of diffuse infiltrating and intravascular large B cell central nervous system (CNS) lymphoma, which has not previously been described in literature. Despite immediate treatment with state of the art chemotherapy, the patient died 3 months after the onset of symptoms. Diffuse infiltrating and intravascular primary CNS lymphoma is a rare cause of rapidly progressive leukoencephalopathy and stroke mediated by neoplastic microvessel occlusion and inflammatory tissue damage. This report intends to increase awareness among neurologists and other stroke physicians about this disease in order to accelerate diagnosis and initiation of treatment.