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Introduction Tailgut cyst or retrorectal cyst hamartoma is a congenital remnant of the embryonic tailgut (1). The developing human embryo has a tail caudal to the cloaca (future anorectal canal), and a portion of the hindgut extends into this tail as the tailgut or post-anal gut (Supplementary Figure S1) (2). Failure of the tailgut to involute by the eighth week of gestation can result in cysts.
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