Case 2. Case 2. Organized hematoma arising from antrochoanal polyp in a 12-year-old girl. A, Contrast-enhanced axial CT scan shows marked irregular nodular.

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Presentation transcript:

Case 2. Case 2. Organized hematoma arising from antrochoanal polyp in a 12-year-old girl. A, Contrast-enhanced axial CT scan shows marked irregular nodular enhancement within a mass in the left maxillary sinus, which protrudes into the ipsilateral posterior nasal cavity through the widened maxillary sinus ostium. B, Axial, fat-suppressed, T2-weighted MR image reveals that the lesion is mixed hypointense and isointense to the inferior turbinate and is located inside the hyperintense antrochoanal polyp occupying the entire left maxillary sinus and posterior nasal cavity. Scattered foci of dark peripheral rim surrounding the lesion are also well demonstrated (arrows). Note the opacified ipsilateral mastoid air cells (*) caused by Eustachian tube obstruction by nasopharyngeal extension of the antrochoanal polyp. C, Contrast-enhanced axial, fat-suppressed, T1-weighted MR image shows the large areas of marked papillary enhancement within the lesion. E.Y. Kim et al. AJNR Am J Neuroradiol 2008;29:1204-1208 ©2008 by American Society of Neuroradiology