Intracranial cell plasma granuloma.

Plasma cell granuloma (PCG) are uncommon non-neoplastic masses of unknown etiology, characterized histologically by proliferation of connective tissue with an inflammatory infiltrate of mononuclear elements. They occur more commonly in the lung and conducting airways, but can also be seen in other tissues, such as the meninges. The imaging appearance of meningeal PCG can simulate more common neoplasms, as menigiomas. At computed tomography (CT) scans, the meningeal PCG presents as an extra-axial hyperdense mass with homogeneous contrast enhancement. On the magnetic resonance images (MRI), the tumor is characterized by isointense to hypointense signal on T1 weighted-images (WI) and hypointense signal on T2WI, with intense and homogeneous contrast enhancement. We report an additional case of meningeal plasma cell granuloma, with emphasis to the differential diagnosis.