The Analysis Of CT, MRI Signs Of Benign And Malignant Tumors In The Tympanic Cavity

Objective: Analysis of imaging features of benign and malignant tumors in thetympanic cavity by CT and MRI.To investigate the clinical value of CT and MRI inthe diagnosis and differential diagnosis of the tumors in the tympanic cavity.Materials and Methods:From January2012to March2015,132cases of the tumors in the tympaniccavity with complete clinical data and confirmed by operation and pathology in ourhospital were collected65male cases and67female cases included, ages between8and82,the average age is39.3±16.2.128cases contain cholesteatoma for120,tympanic paraganglioma for5, facial nerve schwannoma for7, carcinoma of themiddle ear for12. Statistical analysis was performed on the tumor as follows:unilateral/bilateral,gender,age group,unilateral/bilateral,morphology,margins,scopefor growth,tumor center, CT density, MRI signal, MRI enhanced pattern, bonechange and the bone change of the surrounding structure. All statistical dates wereanalyzed by SPSS18.0software packet, and using x2inspection. The rank sum testwas used to examine the difference of ossicular chain involvement between benignand malignant tumors in the tympanic cavity. P <0.05was considered statisticallysignificant.Results:132cases of tympanum tumor patients,the benign tumor accounted for90.9%(120/128),malignant tumors9.1%(8/128). The analysis shows that:(1)morphology,margins,scope for growth,tumor center, MRI enhanced pattern,bonechange and the bone change of the surrounding structure had statistical differences between the malignant and benign tumor(P<0.05).（2）、There were no statisticaldifferences between the malignant and benign tumor withunilateral/bilateral,gender,age group,CT density, MRI signal and ossicular chaininvolvement (P＞0.05).Conclusion：1. Intratympanic benign tumors seen above tympanic cholesteatoma,paraganglioma and facial nerve schwannoma is mainly in mid-inferior tympanum.Performance as morphological rules, bone destruction more sharp edge, In additionto cholesteatoma, MR enhancement scanning showed homogeneous enhancement.2. Malignant tumors in the tympanic cavity are mainly in mid-inferiortympanum. Performance as irregular shape, fuzzy edge, often cause the tympanicwall and the surrounding structure of osteolytic bone destruction, MR enhancementscanning showed inhomogeneous enhancement.3. Sex, age, side, density, MRI signal, ossicular chain damage degree, scutumdamage can not be directly used as the judgment basis of benign and malignanttympanum tumor.4. CT and MRI examinations on the drum indoor tumor preoperative qualitationand localization diagnosis has important auxiliary value and for the choice of clinicalsurgical operation and approach has guiding significance, is conducive to improvethe survival rate and patient quality of life.