label: Thumb hypoplasia grade 3B
label_lc: thumb hypoplasia grade 3b
description: "A type of developmental undergrowth of the thumb, whereby there are musculotendinous and osseous deficiencies characterized by basal metacarpal aplasia with deficient carpometacarpal (CMC) joint, and absence of metacarpophalangeal (MCP) or interphalangeal (IP) joint."