Abstract
A case of partial duplication 13q14 .fwdarw. qter is reported in a 9-yr-old male with clinical symptoms which include trigonocephaly and synophrys, producing an easily identifiable phenotype. [The boy was also severely mentally retarded and showed multiple congenital malformations]. The chromosome duplication resulted from a familial t(10;13)(qter;q14). Subsequently, a normal balanced carrier sibling was diagnosed prenatally.