MedGen

A rare, congenital limb malformation characterized by shortening (hypoplasia or aplasia) of the middle phalanges of the index finger and, sometimes, of the fifth finger. On radiographs, the middle phalanx of the index fingers often appear triangular and in severely affected cases, the index finger is curved radially. The lower limb phenotype is generally milder. [from ORDO]

Brachydactyly type A2 is an autosomal dominant disorder characterized by malformations of the middle phalanx of the index finger and by anomalies of the second toe (summary by Su et al., 2011). [from OMIM]

A form of brachydactyly that presents with the characteristic features of brachydactyly type A2 (shortening of the middle phalanges of the index finger and, sometimes, of the little finger) and type D (shortening of the distal phalanx of the thumb) plus various additional features. It has been reported in one family. [from SNOMEDCT_US]