An Unusual Sinonasal Tumor: Soft Tissue Perineurioma

Sinonasal CT scan. A, A mass in posterior nasal cavity and nasopharynx widens left choanae (arrow). B, Coronal reconstruction shows mass abuts the sphenopalatine foramen (arrow). C, Postcontrast sagittal image shows heterogeneous enhancement of the mass and extension into nasopharynx.