Congenital brachyonychia of both thumbs.
BRACHYONYCHIA (RACKET NAIL)
Brachyonychia (aka racquet nail) is the congenital foreshortening of the nail.
- The congenital type is most common. One or both thumbs are most commonly affected.
- Congenital brachynchia may be associated with other congenital anomalies including facial abnormalities and intellectual disability. The female to male ratio is 3:1.
- Acquired brachyonychia (AB) is rare and most frequently seen in patients with hyperparathyroidism, a main cause of bone abnormalities in chronic kidney disease.
- AB is caused by acro-osteolysis (bone resorption, or erosion) of the distal phalanges.
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