Clin Neuropathol
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The study describes a very rare case of primary extranodal marginal zone Bcell lymphoma of the central nervous system (MZL CNS) with an unusual clinical and radiological presentation mimicking subarachnoid bleeding and subdural hematoma (SDH) after head injury. The patient presented symptoms which had commenced 3 weeks earlier: a gradually-progressing headache associated with periodic right-sided cramp of the face muscles and numbness of the right upper limb. During urgent craniotomy for drainage of the presumed SDH, a tumor mass histopathologically and immunohistochemically matching marginal zone B-cell lymphoma was found. ⋯ The patient underwent successful radiotherapy, and achieved complete response. At present, no evidence of either systemic disease or lymph node enlargement has been found. The recognition of an indolent type of lymphoma in a rare anatomical localization is very important due to the proper management of the patient.