Ultrasonography is a useful imaging modality for the diagnosis of pathologic conditions in the biceps tendon. We describe a 64‐year old man with rheumatoid arthritis (RA) who suddenly developed a painless lump in the antecubital region of the right arm. The bulging was prominent when he flexed his forearm. Proximal loss of the long head in biceps tendon could be demonstrated by ultrasonography. The ultrasonographic features of spontaneous isolated biceps tendon rupture occurring in a patient with RA are described.
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Kim et al. (2007) studied this question.
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