Abstract
A case of endometrial cyst of the groin associated with a decidual reaction in the appendix is presented. The pathogenesis of the lesion is considered, and it is suggested that the aberrant endometrium in the groin arose by metaplasia of “multipotent” serosal epithelium. The absence of a hernial sac and associated pelvic peritoneal endometriosis, and the simultaneous occurrence of ectopic decidua in the appendix lend support to this suggestion.
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