Flexor digitorum accessorius causing tarsal tunnel syndrome in a paediatric patient: A case report and review of the literature.

The flexor digitorium accessorius muscle is an unusual anatomical variant found in the posteromedial aspect of the hindfoot and ankle. As previously described, its location predisposes patients to developing tarsal tunnel syndrome. This case illustrates the diagnosis, treatment and resolution of tarsal tunnel syndrome in a paediatric patient, secondary to the presence of flexor digitorium accessorius muscle.