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FIG 3. A case of postoperative recurrent IP. Patient 2 was referred because of the presence of a polypoid mass in the left superior maxillary sinus wall. This patient had a left nasal fossa IP, which was initially treated with en bloc excision by lateral rhinotomy-medial maxillectomy 15 months before the study was conducted.
A, Conventional MR images (upper left, T1-weighted image [600/20/2]; upper right, PD-weighted image [2500/18/1]; lower left, T2-weighted image [2500/90/1]; lower right, postcontrast T1-weighted image). The T1-weighted image shows isointensity with muscle. The T2-weighted image shows an area of homogeneous hyperintensity in the left superior maxillary sinus wall; the signal intensity is isointense to CSF. Postcontrast studies show homogeneously marked enhancement as compared with enhanced mucosa. The diagnosis of the conventional images is "postoperative changes."
B, ROI analysis shows a color-coded image suggestive of recurrence.
C, Two-parameter scatter diagram shows amplitude (A) plotted against the distribution time (Tc). The A and Tc of the pixels corresponding to the ROI are shown.
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