A 43-year-old man with T10 incomplete, ASIA Impairment Scale (AIS) C, patient with paraplegia who is a wheelchair basketball player presented to our electrodiagnostic laboratory with complaints of bilateral hand numbness after intensive training for a local veteran wheelchair basketball tournament. Previously, the patient had undergone carpal tunnel release but he reported that he did not gain complete relief from symptoms. Motor nerve conduction studies of the median nerve revealed evident prolonged distal latency. Right sensory nerve conduction study showed prolonged latency and delayed conduction velocity while left median sensory nerve action potential could not be elicited. The nerve conduction study findings were compatible to right-sided moderate and left-sided severe neurophysiological carpal tunnel syndrome. Ultrasonographic assessment of left carpal tunnel revealed the presence of abnormal muscle in the carpal tunnel (Fig. 1). The hypoechoic muscle belly next to the median nerve was detected on a static image of the carpal tunnel on the transvers plane at the pisiform bone level. The muscle belly was traced to the forearm, and it was identified as the flexor digitorum. Dynamic imaging was used to identify the muscle. While taking dynamic images of the carpal tunnel at the pisiform level, the patient's fingers were flexed, separately. Dynamic entrapment of the median nerve with the flexion of the index finger was viewed (see the Supplementary material). The patient was advised for rest and splinting and was referred to surgeon for revision surgery.