Primary diffuse large B-cell lymphomas of the temporoparietal dura mater and scalp without intervening skull bone invasion.

A 72-year-old man presented with an extremely rare case of primary diffuse large B-cell lymphomas (DLBCLs) of the dura and scalp existing independently without intervening cranial vault invasion. The patient presented with an indolent mass lesion at the left temporal parietal scalp. Magnetic resonance imaging and computed tomography revealed a solid homogeneously enhanced mass in the left temporoparietal scalp, and an extra-axial intracranial mass that existed just below the scalp without intervening skull invasion. The patient underwent gross total resection of these lesions via a left frontotemporoparietal craniotomy. Histological examination of the masses revealed DLBCLs. The patient received whole-brain radiation therapy, and subsequent chemotherapy with cyclophosphamide, adriamycin, vincristine, and prednisolone. He was discharged without neurological deficit. The present case of DLBCLs in the scalp and dura without intervening skull bone invasion indicates that malignant lymphoma should be considered in the differential diagnosis of scalp and dural tumors without intervening skull bone invasion.