Owen M C, Lamb C R, Lu D, Targett M P
Department of Veterinary Clinical Sciences, The Royal Veterinary College, University of London, London, UK.
Vet Radiol Ultrasound. 2004 Mar-Apr;45(2):149-55. doi: 10.1111/j.1740-8261.2004.04025.x.
The aim of this study was to determine the prevalence and potential significance of finding material in the middle ear of dogs having magnetic resonance (MR) imaging. Of 466 MR studies reviewed, an increased signal was identified in the tympanic bulla in 32 (7%) dogs. Cavalier King Charles spaniels, Cocker spaniels, Bulldogs, and Boxers were over-represented compared to the population of dogs having MR imaging. Five (16%) dogs had definite otitis media and one (3%) had a meningioma invading the middle ear. Of the remaining dogs, 13 (41%) had possible otitis media and 13 (41%) had neurologic conditions apparently unrelated to otitis media. The most common appearance of material in the middle ear was isointense in T1-weighted images and hyperintense in T2-weighted images. There was no apparent correlation between the signal characteristics of the material and the diagnosis. Enhanced signal after gadolinium administration was observed affecting the lining of the bulla in dogs with otitis media and in dogs with unrelated neurologic conditions. In dogs without clinical signs of otitis media, finding an increased signal in the middle ear during MR imaging may reflect subclinical otitis media or fluid accumulation unrelated to inflammation. Brachycephalic dogs may be predisposed to this condition.
本研究的目的是确定在接受磁共振（MR）成像的犬类中耳中发现物质的患病率及其潜在意义。在回顾的466项MR研究中，32只（7%）犬的鼓泡内发现信号增强。与接受MR成像的犬类总体相比，查理士王小猎犬、可卡犬、斗牛犬和拳师犬的比例过高。5只（16%）犬患有明确的中耳炎，1只（3%）患有侵犯中耳的脑膜瘤。在其余的犬中，13只（41%）可能患有中耳炎，13只（41%）患有明显与中耳炎无关的神经疾病。中耳内物质最常见的表现是在T1加权图像中等信号，在T2加权图像中高信号。物质的信号特征与诊断之间没有明显的相关性。在患有中耳炎的犬和患有无关神经疾病的犬中，观察到钆给药后鼓泡内衬有增强信号。在没有中耳炎临床症状的犬中，MR成像时中耳内信号增强可能反映亚临床中耳炎或与炎症无关的液体蓄积。短头犬可能易患此病。
