Anomalous muscle causing ulnar nerve compression at Guyon's canal.

@article{Paraskevas2012AnomalousMC,
  title={Anomalous muscle causing ulnar nerve compression at Guyon's canal.},
  author={Georgios K Paraskevas and Orestis Ioannidis and Dimitrios S Economou},
  journal={Journal of plastic surgery and hand surgery},
  year={2012},
  volume={46 3-4},
  pages={
          288-90
        }
}
We report a rare anatomical variation of an anomalous supernumerary muscle in a male cadaver. It was crossing Guyon's canal, superficial to the ulnar nerve and ulnar artery, and inserted into the aponeurosis of the little finger. This muscle could potentially cause entrapment of the ulnar nerve in Guyon's canal. 

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