The authors present a case of prenatal diagnosis of cloacal anomaly, c
haracterized by the presence of oligohydramnios and cystic pelvic mass
with changing features during observation. Postnatal study confirmed
the presence of a recto-cloacal fistula, with a high confluence of the
urinary, genital and intestinal systems. Both parents had a chromosom
e 9 inversion (p11q13): but the child was chromosomally normal.