title: Adenosquamous carcinoma arising within a retrorectal tailgut cyst: report of a case.
abstract: Retrorectal, developmental tail gut cysts, include dermoid cysts, rectal duplication cysts and retrorectal cyst-hamartomas. Retrorectal cyst-hamartomas (RCH) are derived from remnants of the tail gut, the most caudal part of the embryonic hind gut, which normally involutes by the 8(th) wk of embryonic development (3-8 mm stage). They have specific radiological and histopathological features that distinguish them from other similar formations (dermoid cysts, enteric duplication cysts and teratomas). We report a patient with adenosquamous carcinoma arising within RCH, who underwent complete resection of the cyst through anterior laparotomy, and reached complete (recurrence-free for 14 mo, so far) functional recovery. The cyst was incidentally discovered during hysterectomy 12 years ago. Diagnostic, therapeutic and histopathological aspects of this rare case are discussed. The mentioned period between diagnosis and surgical treatment suggests that RCH, given enough time, can develop malignant degeneration, and should be resected at the time of diagnosis.
authors.affiliation: FRCS, First Surgical Clinic, Koste Todorovica 6, Belgrade 11000, Serbia and Montenegro. scpy@beotel.yu
authors.forename: Zoran
authors.initials: Z
authors.lastname: Krivokapic
authors.forename: Ivan
authors.initials: I
authors.lastname: Dimitrijevic
authors.forename: Goran
authors.initials: G
authors.lastname: Barisic
authors.forename: Velimir
authors.initials: V
authors.lastname: Markovic
authors.forename: Miodrag
authors.initials: M
authors.lastname: Krstic
mesh_terms: D018196:Carcinoma, Adenosquamous / Q000000981:diagnostic imaging / Q000473:pathology*; D003560:Cysts / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D012004:Rectal Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D014057:Tomography, X-Ray Computed