Solitary Fibrous Tumor of the Sinonasal Cavity: CT and MR Imaging Findings

Case 2. A, Coronal CT scan with a bone algorithm shows an oblong well-defined mass in the right nasal cavity with patchy calcification. Note remodeling, thinning, and local absorption of the adjacent bony walls. B, Axial T1-weighted MR image shows a homogeneous isointense signal mass with multiple flow voids in the right nasal cavity. Note the lesion of high signal intensity in the right maxillary sinus. C, Axial T2-weighted MR image shows a heterogeneous isointense signal mass with multiple patchy high-signal-intensity areas, which have no enhancement on the corresponding contrast-enhanced MR images, suggesting cystic degeneration. The lesion in the right maxillary sinus also demonstrates high signal intensity. D, Axial contrast-enhanced MR image shows heterogeneously marked tumor enhancement with multiple flow voids. No enhancement of the lesion of the right maxillary sinus is noted, indicating obstructive maxillary sinusitis. E, Corresponding axial dynamic contrast-enhanced MR image depicts a washout pattern (type III) TIC. F, The round cursors mark the ROIs of the lesion and the right internal carotid artery selected for signal-intensity measurement at dynamic MR imaging.