[Fetal ovarian cyst. A report of a case].

Fetal ovarian cyst is uncommon; it represents the second place of fetal abdominal tumors, after urinary tract tumors. The cause of fetal ovarian cysts still remains unclear, although it is likely to be promoted by hormones. Its prognosis is usually good. Differential diagnosis should rule out urinary tract malformations. A case of a female newborn with giant fetal ovarian cyst, diagnosed on week 37 of the pregnancy period, treated with exploratory laparotomy and cyst exeresis, with serum cystadenoma histopathology diagnosis is presented.