Fig 2. MR images of the IPs concomitant with SCC in 2 different patients. A, Coronal contrast-enhanced, fat-suppressed, T1-weighted image shows a large irregular mass in the right nasal cavity and maxillary sinus. Although the nasal mass displays the characteristic CCP, it is lost in most of the mass of the maxillary sinus. Note the bone destruction at the superior and lateral walls of the maxillary sinus with associated orbital invasion (arrows). B, Axial contrast-enhanced, fat-suppressed, T1-weighted image shows an expansile mass in the left nasal cavity, which displays a diffuse CCP throughout the lesion, indistinguishable from the IP without associated carcinoma. The histology revealed multiple foci of microscopic carcinoma scattered within the tumor.