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Fig. 3. —47-year-old man with concomitant inverted papilloma and squamous cell carcinoma (pathologic group 1). Unenhanced fast spin-echo T2-weighted coronal MR image (TR/TE, 4600/120) discloses intermediate-signal-intensity mass centered in right-sided nasal cavity and maxillary antrum. Convoluted cerebriform pattern is present throughout entirety of mass. Multifocal in situ squamous cell carcinoma was present diffusely in mucosa of this inverted papilloma but did not disturb basic morphologic inverted papilloma pattern. Secondary frontal and ethmoidal obstructive changes are easily differentiated from inverted papilloma.