| Objective To discuss clinical value of spiral CT scanning in showing anatomical structure in chronic otitis media.Method The clinical data and preoperative spiral CT manifestation of 97 cases of chronic otitis media(COM) ere retrospectively comparative analyzed .All cases were diagnosed by operation and pathology.Results Spiral CT can accurately show the occupancy image of different sites and sizes of soft-tissue and the minor bony-erosion image in middle ear. Match rate between CT manifestation and operation was 100% in 16 cases of early COM; 93.3% between CT manifestation of soft-tissue in middle ear and operation; 89.8% between that of bony-erosion and operation; 83.5% between that of osicular cain destruction and operation. 97.2% between that of sequelae of COM and operation. Spiral CT scanning manifestation of early COM was mucosal thickening, distribution of lesions and diffusion, sometimes liquid; That of COM was: 1 mission massive shadow wrapping by low-density central;2 Bone changes,including enlargement of tympanic cavity with sclerotic border, the dislocation and destruction of the ossicles.The sigmoid sinus plate, tympanic tegmen, semicircular canal and facial nerve canal were destroyed in severe cases;3 Sclerotic mastoid was observed in most cases. That of sequelae of COM was calcification shadow with uneven density.Conclusion Spiral CT imaging not only provide with accurate typing and reliable basis for diagnosis and different diagnosis of COM, but also plays an important role in judging scope of bone destruction and sites of soft-tissue filling, making operation programme and evaluting surgical treatment effect. Spiral CT scanning should be as routine examination prior to middle ear and mastoid surgery. |
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