Magnetic resonance pathology of the rotator cuff.

This article reviews the current issues in imaging of the rotator cuff with magnetic resonance imaging (MRI). Important technical issues are discussed, including some of the newer pulse sequences, surface coils, and MR arthrography. Debate continues over what constitutes the normal appearance of the rotator cuff. Issues regarding studies of asymptomatic volunteers, pitfalls in imaging, and MR artifacts such as magic angle effects are discussed. The article also reviews the basic concepts of MR interpretation of pathologic lesions of the cuff, including tendinopathy, partial and complete tears, and the relationships to rotator cuff impingement.