Accessory abductor digiti minimi muscle (hand)
An incidental finding.
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There are two hypoechoic muscle slips crossing the Guyon's tunnel. They have a common origin in the midline wrist and extend to the ulnar palmar region to join the abductor digiti minimi muscle. The two slips encase the patent ulnar artery. The deeper slip separates the ulnar artery from the ulnar nerve. The ulnar nerve shows a normal echopattern without edema.
The ultrasound shows an accessory abductor digiti minimi muscle which is one of the common accessory muscles.
MRI is not available for comparison.
- Paul A. Sookur, Ali M. Naraghi, Robert R. Bleakney, Rosy Jalan, Otto Chan, Lawrence M. White. Accessory Muscles: Anatomy, Symptoms, and Radiologic Evaluation1. (2008) RadioGraphics. doi:10.1148/rg.282075064