Carpal tunnel compression syndrome secondary to a retracted flexor digitorum sublimis tendon.

Carpal tunnel compression syndrome caused by a retracted divided sublimus tendon has been presented. The case presented here represents another cause of carpal tunnel compression syndrome. With resection of the space-occupying retracted and scarred sublimis tendon, the symptoms of median nerve compression remitted. Considering the large volume of hand surgery done annually, it is surprising that this particular cause of carpal tunnel compression syndrome has not been reported previously.