Calcified meconium: an important sign in the prenatal sonographic diagnosis of cloacal malformation.

Cloacal malformation is a rare abnormality, characterized by direct communication between the gastrointestinal, urinary, and genital structures, resulting in a single perineal opening. Prenatal diagnosis is difficult because of nonvisualization of the communication. We report a case of prenatal diagnosis of this condition, in which the recognition of calcified meconium in the colon and urinary tract provided an important clue.