The canal of Nuck is a small evagination of the parietal peritoneum, which is attached to the uterus by the round ligament through the internal inguinal ring into the inguinal canal. This structure is homologous to the processus vaginalis of the male anatomy [1]. Although the canal of Nuck normally disappears without a trace in the first year of life, it can cause an indirect inguinal hernia or hydrocele of the canal of Nuck when, in rare cases, it does not disappear completely. Hydrocele of the canal of Nuck is a rare disease that occurs in the inguinal area or labium as a painless edema before adolescence [2]. We report the case of a hydrocele of the canal of Nuck in a female adult.