Monarch Disease Ontology identifier MONDO_0007216 (brachydactyly type A2) (BDA2) is a congenital malformation characterized by shortening (hypoplasia or aplasia) of the middle phalanges of the index finger and, sometimes, of the little finger. Also known as: BDA2, Mohr-Wriedt type brachydactyly, brachydactyly, Mohr-Wriedt type, brachymesophalangy II.