Ultrasound
The clinically visible lesion is a well-defined echogenic lesion with internal striations without calcification/ cystic changes/ vascularity. Mildly compressible lesion measuring 65 (length) x (width) x 10 (anteroposterior) mm. It is located in the distal forearm ulnar volar side, passes through Guyon's canal, and reaches the hypothenar region. It is located in the ulnar nerve just distal to the dorsal cutaneous branch origin. The lesion splays the ulnar nerve fascicles into three bundles, one being a deep branch, the second being a common branch to adjacent sides of the 4th and 5th fingers, and the third being the ulnar side digital branch of the 5th finger.