兔眼玻璃体内自体睫毛的影像学诊断

Diagnostic imaging of autologous lashes within vitreous body of rabbit

目的探讨超声、多排螺旋CT(MSCT)和磁共振成像(MRI)诊断兔眼玻璃体内自体睫毛的价值。方法将新西兰大白兔32只随机平均分为A、B、C、D四组,每组8只。对A、B、C组大白兔分别于穿刺巩膜后植入1、5、10根睫毛;D组为对照组,穿刺巩膜后仅行可吸收线缝合,不植入睫毛;均于术后1周行B超、MSCT及MR检查,检查结束后处死动物取出眼球行病理学检查。结果A、B、C三组玻璃体内睫毛均可在超声图像上显示;A组MR未检出玻璃体内植入异物,B组中3只兔及所有C组大白兔玻璃体内植入睫毛可在T2WI、T2*WI及SWI序列图像上显示;MSCT仅显示6只大白兔玻璃体内植入物。结论超声检查应作为玻璃体内睫毛检查方法的首选;MR不同扫描序列检出玻璃体睫毛有其优劣之分;MSCT对于玻璃体内睫毛的诊断价值有限。

Objective To observe the value of ultrasonography, MR and MSCT in diagnosing intravitreous autologous eyelashes. Methods Thirty-two New Zealand rabbits were averagely divided into 4 groups （A, B, C and D） randomly, and 1, 5, 10 eyelashes were implanted into vitreous body of rabbits respectively in group A, B, and C, whereas rabbits in group D （the control group） were only exposed to sham operation without implanting any eyelashes. After one week, all rabbits underwent ultrasound, MR and MSCT examination, then the specimens of vitreous bodies were obtained and observed pathologically. Results All the implanted intravitreous eyelashes were displayed with ultrasound. Intravitreous eyelashes in group A were not detected with MRI, whereas in 3 rabbits of group B and all of group C were displayed on T2WI, T2^＊ WI and SWI sequences. MSCT detected intravitreous eyelashes in only 6 experimental animals. Conclusion Ultrasonography should be considered as the first choice for diagnosis of intravitreous autologous eyelashes. Different sequences of MRI have various advantages in diagnosing intravitreous autologous eyelashes, whereas the diagnostic value of MSCT is limited.