Value of Multislice Spiral Computed Tomography in demonstrating Ossicular Chain and diagnosis of Ossicular Destruction in Chronic Otomastoiditis

WU Hong; LAI Qingquan; HUANG Qiming

doi:10.3969/j.issn.1672-2922.2016.03.018

Abstract：Objective To study the value of multislice spiral computed tomography (CT) in showing ossicular chain and diagnosis of ossicular bone destruction in chronic otomastoiditis. Methods Forty patients with chronic otomastoiditis (48 ears) evaluated by the authors from October 2013 to October 2015 underwent multislice spiral CT scanning and transpar-ent multiple plane reconstruction and volume reconstruction to study the morphology of ossicles and middle ear bony struc-ture destruction. The results were compared to normal controls to evaluate the diagnostic accuracy of multislice spiral CT studies. Results Among normal controls, when comparing the MPR technology to volume rendering techniques, there was no significant difference regarding the malleus manubrium and head, incus body and its short and long cruses (P>0.05), but the MPR technology was superior to volume rendering technique in showing the stapes and incudostapedial joint (P<0.05). The accuracy of multislice spiral computed tomography was 100%on the Fallopian canal, incus body and short crus, 94.4%on tympanic cavity walls, long crus of incus and stapes, and 88.8%on malleus in otomastoiditis with granulation;100%on tympanic cavity walls, Fallopian canal and all ossicles in simple otomastoiditis;and 100%on the incus and its long crus, malleus and Fallopian canal, 92.3%on short crus of incus and tympanic cavity walls, and 84.6%on the stapes in otomastoid-itis with cholesteatoma. Conclusion multislice spiral CT provides clear viewing of morphology of middle and inner ear bony structures and erosion in patients with otomastoiditis, and is valuable in distinguishing different types of otomastoid-itis. MPR technology and bulk reconstruction technique can show fine structure of the ear and is valuable in guiding ear sur-geries.