Hayashi Masaru, Tomita Shigeki, Fujimori Takahiro, Nagata Hitoshi, Kubota Keiichi, Shoda Akiko, Tada Kazumi, Kosaka Nobuaki, Fukasawa Ichio, Inaba Noriyuki
Department of Obstetrics and Gynecology, Dokkyo Medical University, Mibu, Tochigi, Japan;
Rare Tumors. 2009 Jul 22;1(1):e21. doi: 10.4081/rt.2009.e21.
Retrorectal epidermoid cyst is one of the developmental cysts which arise from remnants of embryonic tissues. We report a rare case of retrorectal epidermoid cyst, initially diagnosed as an ovarian tumor. Serum SCC value as tumor marker was elevated to the high level. Laparoscopy revealed ovaries, uterus and other pelvic organs were all normal. This tumor existed in the retroperitoneal cavity and compressed the rectum. Later, complete tumor resection was performed by laparotomy. Histological study revealed the epithelium of this tumor consisted of only squamous cells without atypia, and the diagnosis of this tumor was retrorectal epidermoid cyst. Retrorectal epidermoid cyst is very rare, and difficult to diagnose before surgery. However, if we have-knowledge of developmental cysts, and by careful digital examination and image diagnosis, a differential diagnosis can be made.
直肠后表皮样囊肿是一种由胚胎组织残余物形成的发育性囊肿。我们报告一例罕见的直肠后表皮样囊肿病例，最初被诊断为卵巢肿瘤。作为肿瘤标志物的血清鳞状细胞癌抗原（SCC）值升高至高水平。腹腔镜检查显示卵巢、子宫和其他盆腔器官均正常。该肿瘤存在于腹膜后腔并压迫直肠。后来，通过剖腹手术进行了肿瘤全切。组织学研究显示该肿瘤的上皮仅由无异型性的鳞状细胞组成，该肿瘤的诊断为直肠后表皮样囊肿。直肠后表皮样囊肿非常罕见，术前难以诊断。然而，如果我们了解发育性囊肿，并通过仔细的直肠指检和影像诊断，可以做出鉴别诊断。
