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CASE NUMBER 297
Diagnosis

Primary CNS Lymphoma

Note
56-year-old female presented for new onset seizures. There is a partially circumscribed T1 hypointense, T2/FLAIR hyperintense lesion with involvement of both the cortical gray matter and subcortical white matter of the right frontal region. There is prominent diffusion restriction along the cortical margin and juxtacortical white matter. There is marked peripheral vasogenic edema. The lesion effaces the anterior aspect of the right lateral ventricle with lesser mass effect on the frontal horn of the left lateral ventricle. On perfusion images, there was no increased blood volume. A large confluent region of enhancement involving both the cortical gray matter and subcortical white matter is identified on the postcontrast images with the lesion extending to the overlying dural surface. On biopsy, this lesion was found to be a primary CNS lymphoma. CNS lymphoma is often associated with an immunodeficiency state, such as AIDS, organ transplantation, or collagen vascular diseases where immunomodulators are commonly used in therapy. Depending on the patient’s immune status and underlying chronic medical disorders, the appearance is variable with multiple necrotic masses, ventriculitis, CSF infiltration or a single necrotic mass a possibility. 
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