Fig. 2
A 45-year-old woman with unilateral nasal obstruction and proven nasal inverted papilloma. Axial T2-weighted fat suppression image (a) reveals convoluted type of striated pattern. A cystic lesion is seen not considered to interrupt the imaging signature and likely corresponds to histopathology finding of mucus retention cyst lined by glandular epithelium of the tumor. Axial diffusion and apparent diffusion co-efficient maps in (b) and (c), respectively, show average apparent diffusion co-efficient values of 1.5 × 10-3 cm2/s. Axial post-gadolinium-enhanced exam reveals nodular pattern of enhancement corresponding to enhanced glands of the retention cysts. Axial computed tomography (e) reveals smooth mass effect and mild rarefaction of posterior bony nasal septum and medial maxillary wall. Coronal computed tomography image (f) displaying focal cone-shaped hyperostosis with complete obstruction of the ostio-meatal unit shows smooth widening and no defects