Illusion of stroke: intravascular lymphomatosis.

We describe an unusual case of cerebral intravascular lymphomatosis wherein the patient presented with multiple embolic strokes predominantly in the posterior circulation. Using this case as an illustration, we review the literature of this malignancy, which consists of extranodal diffuse large B-cell lymphoma. For patients with recurrent stroke-like events without cardiac risk factors, the accurate diagnosis requires a high index of suspicion by the neurologist and a brain biopsy specimen demonstrating lymphoma cells within the lumen of cerebral blood vessels. Intravascular lymphomatosis can be treated with systemic chemotherapies, but the response rate and pattern of relapse remain unknown.