MRI of suprascapular neuropathy in a weight lifter.

Suprascapular neuropathy results from abnormal compression of the suprascapular nerve, typically at the suprascapular or spinoglenoid notch. This may be produced by either mass effect such as ganglion cyst or by certain repetitive shoulder motions producing wide scapular excursion (e.g., hyperabduction), which causes traction upon the nerve. Certain sports activities such as weight lifting predispose to this type of neuropathy. The clinical presentation is frequently not specific and the patient may be sent for MR evaluation to rule out rotator cuff tear or other more common shoulder abnormalities. This entity should be suspected if MR images demonstrate selective atrophy of the spinatus muscles with a structurally intact rotator cuff.