Abstract:

Objective   To precisely localize the origin of sinonasal inverted papilloma(SIP) by preoperative CT imaging so that the tumor can be thoroughly excised and result in low tumor recurrence. Methods   Sinonasal CT imagines of 25 patients were retrospectively reviewed to contract with the true origin, and the CT values of tumor origin and non-original tissue were calculated and the CT imagines were observed. Results   CT values were(36.87±10.21)HU at tumor origin, which demonstrated a higher density on CT imagines and appeared grey-white, and were (25.32±10.69)HU at the non-original tissue of the tumor, which showed a low density shadow and appeared grey-black. Using paired samples test, there were statistical differences between the two groups(P<0.05); 6 in 20 initial cases presented focal hyperostosis,4 of these cases coincided with the origin of tumor, the Consistency was up to 66.7%, 6 cases had air sign(24%),10 cases had bone displacement(40%) and 10 cases had bone destruction. Conclusion   CT values at the origin of SIP are higher than those at the non-original tissues, associated with bone changes. Air sign is helpful in detecting the tumor origin and making operation plans.

Key words: Paranasal sinuses, Papilloma, inverted, X-Ray computed, Tomography, Nasal cavity