Axillary nerve injury after anterior glenohumeral dislocation: MR findings in three patients.

Objective: We performed this study to demonstrate the MR imaging findings that indicate an anterior dislocation has caused an axillary nerve injury.

Conclusion: MR images of the shoulder can show findings indicating that an axillary nerve injury has been caused by an anterior shoulder dislocation. All MR examinations should be evaluated for these findings, particularly if the patient has a history of anterior shoulder dislocation.

Abnormalities of the long head of the biceps tendon of the shoulder: MR imaging findings.

The normal anatomy of the long head of the biceps tendon of the shoulder has been described in detail [1]. Descriptions of different pathologic processes affecting this structure also have been published [1-3] but have been incomplete, showing only a limited variety of abnormalities. In this article, abnormalities of the long head of the biceps tendon seen on MR images are illustrated in greater variety and detail.

Radial tears of the menisci: MR findings.

Radial meniscal tears have a plane of cleavage oriented across the short axis of the meniscus in the same plane in which radial images are oriented. These tears are important to recognize, because they have clinical implications different from those of other meniscal tears with respect to meniscal function, orthopedic treatment, and clinical course. Depending on their size, location, and orientation, radial tears can have different appearances on standard MR images.

Synovial osteochondromatosis of the shoulder: MR findings.

A case of bilateral shoulder synovial osteochondromatosis demonstrated by magnetic resonance (MR) is presented. Shoulder involvement by synovial osteochondromatosis is unusual, and this case demonstrates the characteristic MR findings.