高分辨率CT联合多平面重组及曲面重组诊断外伤性听力损伤病因

Objective To investigate the value of high resolution CT (HRCT) combined with multiplanar reformation (MPR) and curved planar reformation (CPR) for etiological diagnosis of traumatic hearing injuries. Methods Temporal bone HRCT of 109 cars in 104 patients (99 cases with unilateral car and 5 cases with bilateral cars) with hearing loss caused by traumatic ossicular chain injuries confirmed by surgery were collected, then MPR of ossicular bones and CPR of ossicular chain were performed to observe the manifestations of ossicular chain injuries. Results The detection rate of HRCT combining with MPR and CPR for hammer-anvil and incus-stapes joint dislocation, subluxation and ossicular fracture was all 100%. Among 109 cars, dislocated (44 cars) or subluxated (9 cars) hammer-anvil joint were found in 53 cars (53/109, 48. 62%), dislocation (20 cars) or subluxation (1 cars) of incus-stapes joint were detected in 21 cars (21/ 109, 22.02%), while dislocation of hammer-anvil and anvil-stapes joints co-existed in 29 cars (29/109, 26.61%). Malleus neck fracture combined with malleus anvil joint subluxation, incus short process fracture with malleus anvil joint dislocation, also stapes bone fracture was observed in 1 car (1/109, 0. 92%), respectively. Conclusion HRCT combined with MPR of ossicular bones and CPR of ossicular chain could effectively diagnose traumatic ossicular chain injuries and provide imaging references for etiology of traumatic hearing loss.