Triphalangeal thumb

Definition

A condition caused by failure of the thumb to correctly develop during the antenatal period. This condition is characterised by a long, finger-like thumb with three phalanges instead of two. Isolated triphalangeal thumbs may be associated with genetic abnormality in the 7q36 region.

Also indexed as

Nearby in Structural developmental anomalies of the skeleton

• LB70Structural developmental anomalies of cranium
• LB71Structural developmental anomalies of facial bones
• LB72Structural developmental anomalies of shoulder girdle
• LB73Structural developmental anomalies of spine or bony thorax
• LB74Structural developmental anomalies of pelvic girdle
• LB75Brachydactyly
• LB77Hyperphalangy
• LB78Polydactyly