Hypoplastic/small middle phalanx of the 4th finger, also known as the ring finger.
Synonyms:
exact_synonym:
Brachymesophalangy IV (finger); Hypoplastic/small middle phalanx of ring finger; Hypoplastic/small middle phalanx of the 4th finger; Short middle bone of 4th finger; Short middle phalanx of ring finger