A 39-year-old woman with gradual-onset right-sided headache for last 2 months. Nonhypertensive, nondiabetic, no history of tuberculosis.
Axial T1WI (A), coronal T2WI (B), and postcontrast axial and coronal T1WI (C, D) demonstrate an irregularly shaped right frontal lesion isointense on T1 and centrally hyperintense with hypointense rim on T2, and rim-enhancement. Significant perilesional edema and mass effect are present. Immediate postoperative postcontrast T1W I (E) axial image shows a small residual rim-enhancing lesion. At 6-month follow-up on steroid therapy, axial postcontrast T1WI (F) shows postoperative encephalomalacic changes. No evidence of residual lesion is noted, suggesting complete resolution.
IPT, or plasma cell granuloma, is a rare mass-like proliferation of polyclonal chronic inflammatory cells, predominantly plasma cells. The underlying etiology is poorly understood. These lesions are important benign mimics of aggressive neoplastic processes.