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A torn labrum can certainly give similar symptoms although is less common

The labrum is the rim of tissue around the cup of the shoulder socket. The long head of biceps anchors off the superior labrum.

Labral tears are also known as SLAP lesions (superior labrum anterior posterior) or biceps anchor lesions

Diagnosis of SLAP lesions is best made arthroscopically (keyhole surgery) or with an MRI scan

MRI is also the modality of choice for a cuff tear.

Often labral lesions (superior) can remain untreated. In fact they are recently relatively new diagnosis secondary to the advent of shoulder arthroscopy and MRI

Julian