During a standard wrist ultrasound exam, it might happen to find a bifid median nerve. According to literature it has an incidence of ~3% and may be accompanied by an accessory artery, the persistent median artery of the forearm, which lies in between the two nerve bundles.

Axial ultrasound and T2w Mri scan (0.3 Tesla)

Especially in case of carpal tunnel release it is essential that this particular anatomy be mentioned in your report in order to avoid iatrogenic injuries. Mri scan togheter with dynamic ultrasound examination and electromyography are the best choice for the evaluation of peripheral neuropathies.