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Fig. 1B. —45-year-old man with inverted papilloma. Unenhanced fast spin-echo T2-weighted coronal MR image (4600/120) reveals convoluted cerebriform pattern throughout mass. Pattern consists of low-signal-intensity (arrowheads) and relatively high-signal-intensity (small arrows) striations that probably represent metaplastic squamous epithelium and edematous stroma, respectively. Note mucous-filled gaps between folds of tissue that are difficult to identify with certainty. Secretions after obstruction in lateralmost portion of right-sided maxillary antrum are of extremely high signal intensity (large arrow).