J Korean Orthop Assoc.  2017 Dec;52(6):562-565. 10.4055/jkoa.2017.52.6.562.

Extensor Digitorum Brevis Manus

• Park MH
• Kim NC
• Lee TJ

• KMID: 2421351
• DOI: http://doi.org/10.4055/jkoa.2017.52.6.562

Abstract

Extensor digitorum brevis manus (EDBM) is a rare variation of the extensor muscle of the dorsum of the hand, which is found incidentally during surgery or magnetic resonance imaging (MRI). EDBM arises from the wrist capsule inferior to the extensor retinaculum, which frequently goes into the ulna side of the basis of the proximal phalanx between the 2nd and 3rd fingers. The aim of this report is evaluate to investigate the symptomatic mass on the dorsum of the hand and wrist using an image study (MRI or ultrasonography) to confirm whether it is a tumor or EDBM. Surgical excision was chosen as a treatment.

Keyword

extensor digitorum brevis manus (EMDM)

MeSH Terms

Fingers
Hand
Magnetic Resonance Imaging
Ulna
Wrist

Figure

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  Figure 1 Inflammatory change was observed in magnetic resonance imaging scanning (arrows). (A) T1 axial view. (B) T1 sagittal view.

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  Figure 2 Wrist joint ultrasonography at 2016 shows a muscle on the dorsum of the left wrist.

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  Figure 3 Magnetic resonance imaging scanning at 2016 (arrows) (A: T1 axial view, B: T1 sagittal view) shows hypertrophy of extensor digitorum brevis manus.

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  Figure 4 Excised extensor digitorum brevis manus was 6 cm.

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