Article Figures & Data
Figures
- Fig 1.
CT images of a patient with inverted papilloma.
A and B, Axial and coronal CT images show focal plaquelike hyperostosis in part of right ethmoid sinuses (arrows).
C, Although tumor extends to the right maxillary sinus and nasal cavity, no additional foci of hyperostosis are seen. Intraoperative endoscopic examination confirmed the limitation of tumor origin to the ethmoid sinuses.
- 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.
- Fig 3.
Coronal CT image in a patient with inverted papilloma shows localized cone-shaped hyperostosis of the superior wall of the posterior ethmoid sinus (white arrow). Intraoperative endoscopic examination confirmed that the origin of tumor was located at the superior wall of the right posterior ethmoid sinus.
Tables
- Table 1:
CT relationship between the origins of inverted papilloma and areas of focal hyperostosis
Origin of Inverted Papilloma Confirmed by Surgery Cases* (n) Focal Hyperostosis on CT Coincidence of Focal Hyperostotic Area with Tumor Origin Lateral nasal wall 40 25 21 Maxillary sinus 19 11 11 Anterior ethmoid sinus 16 12 10 Frontal sinus 5 2 2 Sphenoid sinus 5 3 3 Posterior ethmoid sinus 2 1 1 Septum 2 1 1 * In 12 patients, tumor origin extended to more than one compartment of the sinonasal cavity.
Sites Having Areas of Hyperostosis Cone-Shaped Hyperostosis on CT (n) Plaque-Like Hyperostosis on CT (n) Lateral nasal wall 0 25* Maxillary sinus 6 5 Anterior ethmoid sinus 0 12† Frontal sinus 2 0 Sphenoid sinus 2 1 Posterior ethmoid sinus 1 0 Septum 1 0 * Four of the lesions proved not to coincide with the origin of tumor.
† Two of the lesions proved not to coincide with the origin of tumor.
