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Cubital Bursitis Caused by Localized Synovial Chondromatosis of the Elbow. A Case Report*

Cubital bursitis at the insertion of the biceps tendon is uncommon4. A number of etiological factors of bursitis have been identified, including direct trauma, rheumatoid arthritis, crystal deposition disease, pigmented villonodular synovitis, and infection8. We report on a patient who had cubital bursitis due to synovial chondromatosis localized at the annular periradial recess that encircles the radial neck of the elbow joint. To our knowledge, this is the first such report in the literature.

A twenty-eight-year-old man was referred to our institution for evaluation of a mass that had been present for ten months in the right antecubital fossa. The patient reported no history of trauma and was in good general health.

On examination, a cystic mass, measuring approximately three by five centimeters, was identified in the antecubital fossa. When compared with the contralateral elbow, the right elbow lacked 10 degrees of full active extension and 10 degrees of full active flexion. The forearm pronated 60 degrees and supinated 90 degrees. Motion of both the elbow and the forearm was pain-free. No locking or crepitation was noted on passive motion of the elbow. The neuromuscular examination of the hand revealed normal findings.

Standard anteroposterior and lateral radiographs demonstrated distortion of the radial head and neck (Figs. 1-A and 1-B). The radial neck was sclerotic and narrowed, resembling an apple core, and the radial head appeared enlarged, with irregularity of the proximal radio-ulnar joint. A soft-tissue swelling was seen lying anterior to the radial head and neck. Magnetic resonance imaging demonstrated that the lesion was composed of two portions: a cystic mass in the antecubital fossa and a segment encircling the narrowed radial neck. On the T1-weighted image made with enhancement with gadolinium-diethylene triamine …