[Iniencephalus apertus. Report of a case (author's transl)].

A macro and microscopic study carried out on an iniencephalic fetus weighing 650 g. is reported. This fetus is especially interesting as it presents anencephaly, supporting the view of classifying together iniencephaly and anencephaly with retroflexion. The main malformations present were: supernumerary ectopical thymus, esophageal atresia with inferior T-E fistula (Type V of Ladd), pulmonary hypoplasia with accessory lung, transposition of the large vessels, rectal atresia, single kidney, persistence of the urogenital sinus and single umbilical artery. The possible etiopathogenic causes are discussed and an embryological interpretation of the principal malformations is given.