Cubital Tunnel Syndrome Caused by a Synovial Cyst From the Ulnohumeral Joint.

Compression neuropathies of the upper limb encompass a range of conditions in which nerve entrapment along its anatomical course results in clinical signs and symptoms that significantly impact patient quality of life and function. Early diagnosis and individualized treatment are essential elements of daily clinical practice. Depending on the nerve involved, various anatomical compression sites have been identified. In the case of the ulnar nerve, compression at the elbow may be caused by anatomical structures or joint-related pathological conditions, such as synovial cysts or vascular malformations. Although rare, these latter causes hold high academic value for both trainees and experienced plastic surgeons.