Background:

A Nuck cyst is an entity produced by the persistence of the processus vaginalis in women, which causes a cyst that according to its relation to the abdominal cavity can be divided into type I, II or III, an inguinal hernia or both simultaneously. There are no precise epidemiological data, since there are only reports and case series, where a nonspecific clinical picture is concluded.

Case report:

We present a 22-year-old female patient with a right inguinal tumor compatible with a right inguinal hernia; she underwent surgical exploration, with findings of a cystic tumor of 15 cm in length containing the round ligament; the histopathological analysis confirmed it was a mesothelial cyst compatible with a type II Nuck cyst.

Conclusions:

Nuck cyst or female hydrocele is a low incidence entity, with no specific clinical picture and non-typical presentation, that can coexist with hernias of the inguinal region. Its diagnosis and treatment are not well established due to the lack of studies; histopathology is an indispensable tool. Nuck cysts should be considered as a differential diagnosis when addressing a tumor of the inguinal region in women.

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