HRCT of Chronic Otomastoiditis Damaging Tympanic Wall

Objective:To study the clinical value and CT features of chronic otimastoiditis tympanic wall by HRCT.Methods:CT features of chronic otomastoeditis damaging tympanic wall in 28 cases(32 ears)were proved by clinical and operation,respectively.In 32 ears,simple type in 3 ears,cholesteatoma type in 17 ears,and granuloma type in 12 ears.Results:HRCT features in 32 ears(28 cases)of chnonic otomastoiditis damaging tympanic wall as following:1.In roof of tympanum abnormal 8 ears(25%),osteoporosis 2 ears,thin bone wall 1 ear,bone destruction 5 ears.2.In carotid canal abnormal 6 ears(18.7%),Osteoperosis 2 ears,osterosclerosis 3 ears,and bone plate defect 1 ear.3.In jugular foramen abnormal 5 ears(15.6%),osteoporosis 2 ears,thin bone wall 1 ear,bony defect 2 ears.4.In sigmoid sinus wall abnormal 13 ears(40.6%),Sigmoid groove defect 3 ears,antrum tympanicum enlargement 10 ears erosion and dislocation of auditory ossicles 5 ears.5.In Labyrinthine wall abnormal 7 ears(11.9%),promontory of tympanum defect 1 ear,vestibular window 1 ear,Fenestra cochleae window 2 ears,facial nerve canal defect 2 ears,semicircular canal defect 1ear.6.In tympanic membrane abnormal 21 ears(65.8%),tympance membrane defect 7 ears,tympance membrane thickening 7 ears,tympane membrane invagination 5 ears,exterial canal wall erosion 2 ears.Conclusion:Axial and coronal view of HRCT had its clinical value in the diagnosis of position,extension,secondary changes in chronic otomastoiditis damaging tympanic wall for operation treatment.