Alves-Nores V, Plested M J, Rubial R, Salgüero R
Diagnostic Imaging Department, Lumbry Park Veterinary Specialists, Alton, United Kingdom.
Hospital Veterinario Puchol, Madrid, Spain.
Front Vet Sci. 2024 Jul 12;11:1304066. doi: 10.3389/fvets.2024.1304066. eCollection 2024.
The assessment of the integrity of the tympanic membrane (TM) can be a diagnostic challenge in patients with otitis externa and/or otitis media (OM) under an otoscopic examination. In computed tomography (CT), the TM is not always visualized. However, a positive contrast canalography using conventional radiography has been previously described to evaluate the TM integrity.
This single-center study aimed to describe the positive contrast canalography technique in CT and its usefulness in identifying TM integrity in 11 dogs.
Dogs with clinical signs of ear disease underwent CT canalography following a systematic protocol.
The presence of contrast medium and contrast homogeneity within the tympanic cavity was assessed, confirming TM rupture when contrast medium was present in the tympanic cavity. CT canalography was performed in 16 ears, and in 7 of the 16 ears (44%), there was a contrast in the tympanic cavity, confirming TM rupture (positive CT canalography result). In two of the seven cases (29%), rupture of the TM was identified in both otoscopic and CT canalography. In the remaining five of the seven (71%) positive CT canalography results, tympanic membrane rupture was identified only by CT canalography.
In conclusion, a positive contrast CT canalography is a complementary and safe technique to assess TM integrity, with a potentially higher sensitivity than otoscopic examination for the diagnosis of TM rupture in dogs.
在耳镜检查中，评估外耳道炎和/或中耳炎（OM）患者的鼓膜（TM）完整性可能是一项诊断挑战。在计算机断层扫描（CT）中，TM并不总是能被可视化。然而，先前已有文献描述使用传统放射摄影进行的阳性对比剂耳道造影来评估TM的完整性。
这项单中心研究旨在描述CT中的阳性对比剂耳道造影技术及其在识别11只犬TM完整性方面的有用性。
有耳部疾病临床症状的犬按照系统方案接受CT耳道造影。
评估鼓室内造影剂的存在情况和造影剂均匀性，当鼓室内存在造影剂时确认TM破裂。对16只耳朵进行了CT耳道造影，在这16只耳朵中的7只（44%），鼓室内有造影剂，确认TM破裂（CT耳道造影结果为阳性）。在这7例中的2例（29%），耳镜检查和CT耳道造影均发现TM破裂。在其余5例（71%）CT耳道造影结果为阳性的病例中，仅通过CT耳道造影发现鼓膜破裂。
总之，阳性对比剂CT耳道造影是评估TM完整性的一种补充且安全的技术，对于诊断犬的TM破裂，其敏感性可能高于耳镜检查。
