Ulnar nerve compression by accessory abductor digiti minimi muscle

Abstract

We report two cases of accessory abductor digiti minimi muscle causing ulnar nerve compression at the Guyon’s canal. One case had venous malformations on the palm with gangrenous left little finger terminal phalanx. Excision of the abnormal muscle relieved patient symptoms. Though the abnormal muscle is reported in literature, the number of symptomatic clinical cases due to muscle compression is rare. The diagnosis itself might be missed because of lack of awareness.