Figure 3.155. Absence of the labia majora is present in about 60% of infants with popliteal pterygium syndrome.

Figure 3.156. Prader-Willi syndrome presents in the neonate with marked hypotonia, a weak cry, and hypogonadism at birth. In Prader-Willi syndrome the mother may note decreased fetal activity, and diere is a breech presentation in about 30% of cases. Although born at term, die infants are usually small, weighing less than 3000 g. There is a characteristic history of feeding difficulty which may result in failure to thrive. The condition is sporadic and there is a preponderance of males. In Prader-Willi syndrome, the karyotype is abnormal in about 50% of cases (deletion 15q).

15q Deletion Karyotype
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