Abstract：
The present case report aims to outline the post-mortem findings of an East Asian finless porpoise with upper aerodigestive tract obstruction using different post-mortem computed tomography (PMCT) visualization techniques and discusses the potential cause of death of this individual. A dead-stranded adult male East Asian finless porpoise was recovered from the Northern coast of Jeju Island, Republic of Korea. The carcass was frozen in Jeju National University within 2 h upon first reported. The PMCT examinations were performed at 120 kVp, 200 mAs with a section thickness of 1 mm. The scan field of view (sFOV) was set to 400 mm. Four image rendering techniques, including multi-planar reconstruction, three-dimensional volume rendering, perspective volume rendering, and minimum intensity projection technique, were used to aid the diagnosis of upper aerodigestive tract obstruction in the stranded finless porpoise. Conventional necropsy was performed to provide a complete necropsy report. Using PMCT, a Sebastidae of 24 cm measured length was found to be lodged in the left pharyngeal food channel and esophagus of the finless porpoise. Hard rays of the pectoral fin of the lodged fish have impaled the esophageal mucosa. Fishing gear was found to embed at the dorsal side of the lodged fish. The trachea was compressed ventrally and the arytenoepiglottic tube opening has been narrowed, which may precipitate to the finless porpoise difficult breathing. Pulmonary hyperinflation, pulmonary edema, pneumothorax, pneumopericardium, and pneumorrhachis were observed. This case report represents the first documentation of potential radiological indicators of upper aerodigestive tract obstruction in the East Asian finless porpoise using PMCT. Spatial location of the lodged item could be rendered in situ as the time of death. It has demonstrated that PMCT could provide objective measurements to adjunct the necropsy findings in diagnosis of fatal aerodigestive tract obstruction in stranded cetaceans.
摘要：
本病例报告旨在使用不同的尸检计算机断层扫描（PMCT）可视化技术概述东亚无鳍海豚上消化道阻塞的尸检结果，并讨论该个体的潜在死亡原因。从济州岛北部海岸发现了一只死掉的成年雄性东亚江豚，大韩民国。尸体在首次报道后2小时内在济州国立大学冷冻。PMCT检查在120kVp下进行，200mAs，截面厚度为1mm。扫描视场(sFOV)设定为400mm。四种图像渲染技术，包括多平面重建，三维体绘制，透视体渲染，和最小强度投影技术，用于帮助诊断搁浅的江豚的上消化道阻塞。进行常规尸检以提供完整的尸检报告。使用PMCT，发现24厘米长的Sebastidae卡在无鳍海豚的左咽食物通道和食道中。滞留鱼的胸鳍的硬射线刺穿了食道粘膜。发现渔具嵌入在滞留鱼的背侧。气管被腹侧压缩，会厌管开口变窄，这可能会沉淀到江豚呼吸困难。肺过度充气,肺水肿,气胸,心包积气,并观察到肺出血。此病例报告代表了使用PMCT的东亚江豚上消化道阻塞的潜在放射学指标的第一份文献。存放物品的空间位置可以作为死亡时间在原地呈现。已经证明，PMCT可以提供客观的测量结果，以辅助尸检结果，以诊断滞留鲸目动物的致命消化道阻塞。
