Adachi Eisuke, Nagai Hiroyuki, Saito Makoto, Osawa Akihiro
Department of Infectious Diseases and Applied Immunology, IMSUT Hospital of The Institute of Medical Science, The University of Tokyo, Tokyo, Japan.
Osawa Gastro Entero Proctology & Endoscopy Clinic Shinagawa, Tokyo, Japan.
Am J Trop Med Hyg. 2025 Jul 29. doi: 10.4269/ajtmh.25-0254.
We report two recent cases of diphyllobothriid cestode infection identified during colonoscopy in asymptomatic individuals in Tokyo, Japan. Both patients lacked distinctive dietary habits, consuming only commonly available raw fish. In one case, the tapeworm was found in the terminal ileum; in the other case, the parasite extended into the ascending colon, which is a rare site of detection during colonoscopy. Morphological features were consistent with Dibothriocephalus nihonkaiensis. Blood tests revealed no notable abnormalities. These cases underscore that such infections may occur even in individuals without high-risk dietary behaviors. With increased use of colonoscopy and the global consumption of raw fish, similar detections may become more common, emphasizing the need for clinical awareness, even in patients without recognized dietary risk factors.
我们报告了最近在日本东京通过结肠镜检查在无症状个体中发现的两例阔节裂头绦虫感染病例。两名患者均无特殊饮食习惯，仅食用常见的生鱼。其中一例，绦虫在回肠末端被发现；另一例，寄生虫延伸至升结肠，这在结肠镜检查中是罕见的发现部位。形态学特征与日本阔节裂头绦虫一致。血液检查未发现明显异常。这些病例强调，即使在没有高风险饮食行为的个体中也可能发生此类感染。随着结肠镜检查的使用增加以及生鱼在全球范围内的消费，类似的发现可能会变得更加普遍，这凸显了临床意识的必要性，即使是在没有公认饮食风险因素的患者中。
