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| Imaging Analysis of Maxillary Sinus Tumors |
| Shijingshan Teaching Hospital of Capital Medical University Beijing Shijingshan Hospital，Beijing 100043，China |
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Abstract Objective：To investigate the imaging findings of maxillary sinus tumors in order to improve the levels of diagnosis and differential diagnosis.Method：CT and MRI data of 89 cases with maxillary sinus tumors confirmed histopathologically were analyzed retrospectively.Result：Inverted papilloma，25 cases were connected with the nasal mass.CT：72.7% showed moderate soft-tissue density，13.6% visible calcification，close to 72.7% compression deformation of bone，45.5% bone absorption，18.2% bone destruction.MRI：The leisions showed isointensity or slight hypointensity on T1WI and isointensity or slight hyperintensity on T2WI.Postcontrast MR showed heterogeneous enhancement and 83.3% showed“ cerebriform” enhancement.Hemorrhagic and necrotic polyps，6 cases were lobulated and located in the maxillary sinus fontanelle Department.CT：heterogeneous density.MRI：T1WI showed slightly lower signal，T2WI showed high signal central area with a low signal intensity rim.Postcontrast MR showed obviously heterogeneous enhancement.Squamous cell carcinoma，23 cases showed the masses along the outside wall of the maxillary sinus formed invasive irregular thickening or tumors.CT：52.4% asymmetrical density，4.8% visible calcification，associated with bone destruction of sinus walls，of which 82.4% could be seen inwall bone destruction.MRI：T1WI showed hypointensity，isointensity or slight hyperintensity，T2WI showed isointensity or hypointensity，and postcontrast MR showed inhomogeneous enhancement.Of adenoid cystic carcinoma in 9 cases，CT：57.1% uneven density.MRI：The leisions showed hypointensity，isointensity or slight hyperintensity on T1WI and hyperintensity or inhomogeneous intensity on T2WI.Postcontrast MR showed inhomogeneous enhancement.Other rare tumor had its own characteristics. Conclusion：CT provides clear view of bone changes and has an important value in benign and malignant.MRI which can show the pathological features of tumors and demonstrate optimally the extent of the lesions suggests the diagnosis and clinical stage.Combined imaging commodities can provide more comprehensive information for the tumor in maxillary sinus.
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