Elbow
Elbow Axial 3

Normal Variant
An accessory muscle termed the anconeus epitrochlearis is sometimes visible at this level. Although not present in the MR image here, it would be located posterior to the medial epicondyle and adjacent to the ulnar nerve. When present, this accessory muscle can cause ulnar nerve entrapment.
Elbow Axial 8

Pathologic process
The distal biceps tendon lacks a tendon sheath; therefore, inflammation in the distal biceps tendon should not be diagnosed as “biceps tenosynovitis.” Instead, a fluid collection in the antecubital fossa is most often a bursitis and can occur in association with partial tears of the biceps tendon.

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