Choi Jin Woong, Lyu Ah-Ra, Ryu Kyeung A, Kim Dami, Park Yong-Ho
a Department of Otolaryngology-Head and Neck Surgery, Chungnam National University, Daejeon, Republic of Korea ;
b Department of Medical Science, Chungnam National Univesersity, Daejeon, Republic of Korea ;
Acta Otolaryngol. 2016 Jul;136(7):682-6. doi: 10.3109/00016489.2016.1157266. Epub 2016 Mar 23.
Pneumolabyrinth is a very rare condition, even in otic capsule disrupting (OCD) fracture. Hearing was not always impaired, even in cases with OCD fracture. The co-existence of pneumocochlea, regarded as a risk factor for total hearing loss, was extremely rare in cases of pneumolabyrinth.
The purposes of this study were to analyze the radiological and clinical features in patients with pneumolabyrinth and to overcome the diagnostic pitfalls encountered during pneumocochlea detection.
The temporal bone computed tomographies (TBCT) of 402 patients diagnosed with temporal bone fracture along with their clinical records were retrospectively reviewed.
Only six patients (7% of those with OCD fractures or 1.5% of those with temporal bone fracture) were found to have pneumolabyrinth. Locations of the pneumolabyrinth were in the vestibule in all six cases and three of them showed air densities both in the cochlea and semicircular canal. The size of the air density in the vestibule was 5.38 ± 4.56 mm(2) at the axial view and 6.57 ± 5.67 mm(2) at the coronal view. The mean minimal Hounsfield unit (HU) of air density area in the vestibule was -968.1 ± 22.94 at the axial view and -941 ± 16.88 at the coronal view. Patients with pneumocochlea eventually developed total hearing loss.
即使在耳囊破裂（OCD）骨折的情况下，中耳迷路积气也是一种非常罕见的病症。即使在患有OCD骨折的病例中，听力也并非总是受损。中耳迷路积气病例中，被视为全聋危险因素的耳蜗积气共存情况极为罕见。
本研究的目的是分析中耳迷路积气患者的放射学和临床特征，并克服在检测耳蜗积气过程中遇到的诊断陷阱。
回顾性分析402例诊断为颞骨骨折患者的颞骨计算机断层扫描（TBCT）及其临床记录。
仅6例患者（占OCD骨折患者的7%或颞骨骨折患者的1.5%）被发现有中耳迷路积气。所有6例中耳迷路积气均位于前庭，其中3例在耳蜗和半规管均显示气体密度。前庭气体密度在轴位视图下大小为5.38±4.56mm²，在冠状位视图下为6.57±5.67mm²。前庭气体密度区域的平均最小亨氏单位（HU）在轴位视图下为-968.1±22.94，在冠状位视图下为-941±16.88。患有耳蜗积气的患者最终发展为全聋。
