Melnick-Needles syndrome in males: a lethal multiple congenital anomalies syndrome

Abstract

A male fetus with decreased calvarial mineralization and suspected omphalocele was identified prenatally in a woman with oligohydramnios and Melnick-Needles syndrome (MNS). At autopsy, exophthalmos, prune belly sequence with urethal atresia and megacystis, tetralogy of Fallot, atrioventricular canal defect, and complete malrotation of the gut were identified. Mandibular hypoplasia and delicate, bowed, irregular, long bones and ribs with widening and deep cupping of the metaphyses were found radiographically. In addition, we review 3 previously reported cases of males with similar, lethal malformations, all born to mothers with MNS. It is our conclusion that these anomalies characterize the male MNS phenotype. A review of all reported viable individuals with MNS identified 2 distinct entities: a mild form found only in females, compatible with normal life expectancy in most cases and inherited in an X-linked dominant male lethal or sex limited autosomal dominant pattern, and a different, more severe disorder, termed precocious osteodysplasty, found in both males and females and inherited as an autosomal recessive trait.