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Fig 2. CT and MR images of patients with inverted papilloma of the maxillary sinus.
A, Axial CT image of a patient with inverted papilloma shows cone-shaped focal hyperostosis involving the posterior wall of the left maxillary sinus (arrows).
B, Sagittal T2-weighted MR image of the patient clearly shows the centrifugal pattern of tumor growth with a hyperostotic focus (white arrow) at the posterior wall of the left maxillary sinus, which was confirmed to be a tumor origin by surgery.
C, Axial CT image of another patient shows cone-shaped hyperostosis (arrow) involving the anterior wall of the left maxillary sinus, which was proved to be the origin of inverted papilloma by intraoperative endoscopy.
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