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Fig. 2. —47-year-old man with concomitant inverted papilloma and focal squamous cell carcinoma (pathologic group 2). Contrast-enhanced spin-echo T1-weighted axial MR image (TR/TE, 500/19) reveals inhomogeneously enhancing tumor destroying medial and anterior walls of left-sided maxillary antrum (small arrows). Tumor also directly invades retromaxillary fat pad (arrowhead). Poorly enhancing area (large arrow) in lesion represents gross central necrosis. Because this patient had predominantly squamous cell carcinoma with only small component of inverted papilloma, cerebriform pattern was not identified throughout entire mass as in other patients (Figs. 1A,1B,1C,1D and 3), who had inverted papilloma with or without small foci of coexisting squamous cell carcinoma not identified in this tumor.