Anconeus epitrochlearis muscle

Case contributed by Dr Daniel Zimmermann Stefani


Lateral elbow pain

Patient Data

Age: 56
Gender: Female

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.

Case Discussion

Accessory muscles are relatively common findings in musculoskeletal exams. Most of them are asymptomatic, but occasionally, because of the mass effect, they can cause compressive neuropathies. Accessory muscles also may cause a palpable mass, as an example the accessory soleus muscle in the ankle.

The anconeus epitrochlearis muscle is usually asymptomatic, but may be the cause of ulnar neuropathy in some patients. 

PlayAdd to Share

Case information

rID: 38153
Published: 9th Jul 2015
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.