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Transverse ultrasound image at the cubital tunnel, with the elbow in flexion position.
An accessory muscle belly (A) is seen superficially in the cubital tunnel, consistent with the anconeus epitrochlearis muscle. The ulnar nerve is also seen (U). The patient also had a lateral epicondilitis (not shown) and had no pain at the medial elbow. This suggests the fact that the muscle is an incidental finding.
Both structures appear hypoechoic due to anisotropy.