CASE HISTORY :
We report the case of a male 20 years old, previously healthy presented
with numbness and pain along the little left finger.
He complained about diffculty in holding objects and reported a wrist
trauma 2 months earlier.
On examination ,there was a pulsatile mass on the ulnar border of the
wrist (figure 1) , a remarkable atrophy of the palmer and dorsal
interosseous (figure 2) , abductor digiti minimi ,and abdcutor pollicis
muscle.
Wartenberg and Tinel signs were positive in the left hand and Froment
test was also positive.
Prolonged distal sensory latency of 2.56 ms (compared to 3.4 ms in the
right hand) was showed in the conduction of velocity studies of the left
ulnar nerve ,also a decreased sensory velocity , a lowered conduction
velocity of the motor nerve at the wrist and reduced amplitude of the
interosseous muscle.
These electrodiagnostic studies suggest compression of the ulnar nerve
at the wrist.
Magnestic resonance imaging was not performed however doppler ultrasound
showed an aneurysm of the ulnar artery comperssing the ulnar nerve at
the guyon’s canal.