A patient may develop the Guyon Canal Syndrome of the distal ulnar nerve if certain conditions are present at the wrist.
Synonym: pisohamate tunnel syndrome
Feature of Canal |
Anatomic Feature |
beginning |
proximal edge of the volar carpal ligaments |
roof |
palmar carpal ligament, palmaris brevis muscle, origins of the hypothenar muscles |
floor |
tendons of the flexor digitorum profundus, transverse carpal ligament, pisohamate ligament, pisometacarpal ligament |
medial border |
pisiform bone, tendon of the flexor carpi ulnaris |
lateral wall |
tendons of the extrinsic flexors, transverse carpal ligament, hook of the hamate bone |
end |
fibrous arch of the hypothenar muscles |
Possible causes of the Guyon canal syndrome:
(1) ganglion or other cyst at the wrist
(2) aneurysm of the ulnar artery
(3) lipoma or other soft tissue tumor at the wrist
(4) anomaly of a muscle or tendon at the wrist
(5) fracture
(5a) distal radius and/or ulna
(5b) pisiform bone
(5c) hook of the hamate
(5d) other wrist bones along the hypothenar aspect
(6) chronic repetitive trauma (bicycling, manufacturing, etc)
Specialty: Neurology
ICD-10: ,