Accessory muscles of the forearm, wrist and hand

Last revised by Craig Hacking on 19 Jul 2023

Accessory muscles of the forearm, wrist and hand are muscular, usually asymptomatic, anatomical variants that might be encountered on imaging studies and confused with pathologic conditions.

The following accessory muscles around the forearm, wrist and hand have been described 1-6:

Accessory muscles look like other muscles in imaging studies.

The radiological report should include a description of the following features:

Accessory muscles might mimic pathological conditions such as tumors or mass lesions. 

Accessory muscles of the forearm, wrist, and hand have been implicated in the following clinical conditions 1-5:

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Cases and figures

  • Case 1: accessory abductor digiti minimi
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  • Case 2: flexor carpi radialis brevis vel profundus
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