Unknown syndrome in sibs: microcephaly, seizures, mental retardation, congenital heart disease, and skeletal abnormalities.

We present two male sibs with a series of malformations including microcephaly, mental retardation, congenital heart disease, skeletal abnormalities, micropenis, and mild hypothyroidism. Both have had seizures. While the pattern of abnormalities is similar to that previously reported in this journal as an unknown syndrome, the facies is clearly distinct, the hypothyroidism is mild, micropenis is present, and there are additional minor skeletal abnormalities.