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Bilateral extensor digitorum brevis manus.

John M Froelich1, Mahsa Bidgoli-Moghaddam, Steven L Moran

  • 1Department of Orthopedics, Mayo Clinic, 200 1st St SW, Rochester, MN 55901, USA. johnfroelich@hotmail.com

Orthopedics
|September 8, 2012
PubMed
Summary
This summary is machine-generated.

Dorsal wrist pain may stem from the extensor digitorum brevis manus, a rare muscle anomaly. Surgical intervention may be needed for symptomatic bilateral cases, highlighting its importance in differential diagnosis.

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Area of Science:

  • Orthopedic Surgery
  • Anatomy
  • Musculoskeletal Imaging

Background:

  • Dorsal wrist pain and swelling are often misdiagnosed as dorsal wrist ganglions.
  • The extensor digitorum brevis manus is an uncommon anomaly that can mimic ganglion cysts.

Observation:

  • A case study details bilateral symptomatic extensor digitorum brevis manus in a young patient requiring surgery.
  • This muscle anomaly is found in 3% of the population, typically symptomatic with strenuous activity or extreme wrist extension.

Findings:

  • The extensor digitorum brevis manus is located in the fourth wrist compartment, often inserting on the index finger.
  • Physical examination reveals a spindle-shaped mass near the extensor mechanism, moving with tendon action.
  • MRI shows a dorsal mass with muscle-like signal intensity, consistent with the anomaly.

Implications:

  • Accurate diagnosis of extensor digitorum brevis manus is crucial for effective treatment, differentiating it from common dorsal wrist ganglions.
  • Surgical excision is an option for refractory cases, emphasizing the need to preserve the index extensor mechanism.
  • This case underscores the importance of considering rare anatomical variations in the differential diagnosis of dorsal wrist masses.