Brachydactyly-syndactyly, Zhao type is a recently described syndrome associating a brachydactyly type A4 (short middle phalanges of the 2nd and 5th fingers and absence of middle phalanges of the 2nd to 5th toes) and a syndactyly of the 2nd and 3rd toes. Metacarpals and metatarsals anomalies are common.

Webbing or fusion of the toes, involving soft parts only or including bone structure. Bony fusions are referred to as \"bony\" Syndactyly if the fusion occurs in a radio-ulnar axis. Fusions of bones of the toes in a proximo-distal axis are referred to as \"Symphalangism\".