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Ulnar tunnel syndrome--an unusual cause
1Department of Plastic, Reconstructive and Hand Surgery, Lister Hospital, Stevenage, United Kingdom.
Summary
A rare case of anomalous muscle in Guyon's canal caused ulnar tunnel syndrome. This condition spared the ulnar nerve's motor branch and hypothenar muscles.
Area of Science:
- Anatomy
- Neurology
- Orthopedics
Background:
- Guyon's canal is a critical anatomical space in the wrist housing the ulnar nerve.
- Ulnar tunnel syndrome typically results from compression of the ulnar nerve within this canal.
- Anomalous muscles are rare but recognized causes of peripheral nerve entrapment.
Observation:
- A patient presented with symptoms suggestive of ulnar tunnel syndrome.
- Intraoperative findings revealed an anomalous muscle belly located within Guyon's canal.
- This anomalous muscle was identified as the cause of ulnar nerve compression.
Findings:
- The anomalous muscle caused compression of the ulnar nerve at Guyon's canal.
- Notably, the compression pattern spared the motor branch supplying the hypothenar muscles.
- This selective sparing is an unusual presentation of ulnar tunnel syndrome.
Implications:
- This case highlights the importance of considering anomalous muscles in the differential diagnosis of ulnar tunnel syndrome.
- Understanding precise anatomical variations is crucial for accurate diagnosis and surgical planning.
- Such findings contribute to the detailed anatomical and clinical understanding of peripheral nerve entrapment syndromes.