Cranial vault lymphoma- An unusual presentation of primary disease.

Diffuse cranial vault and concurrent dural based disease involvement by primary CNS lymphoma is extremely rare. Often such presentations are overlooked initially as benign lesions and biopsy of lymph nodes elsewhere remains source of diagnosis in majority of patients. Diffuse large B-cell lymphoma is a subtype of primary CNS lymphoma with subdural involvement that is diagnosed based on imaging. Though features may overlap with invasive meningioma, MRI remains the modality of choice to help differentiate on the basis of characteristic appearances.The case of a patient with scalp swelling and unusual imaging features of primary dural lymphoma is presented.