Suprascapular Nerve Entrapment by Paralabral Cyst- A Case Report

History: A 30 year old male presented with history of pain in the left shoulder.Examination findings revealed weakness of the left supraspinatus and infraspinatus muscles.

MRI Observations:

  • Tear of the posterior inferior glenoid labrum was noted.
  • A large multiloculated cystic lesion was seen extending from the posterior
  • spino-glenoid notch to the suprascapular notch measuring 3.3cm in superoinferior extent and 1.7cm in transverse dimension as seen on the sagittal images. It was seen to cause entrapment of the suprascapular nerve.
  • Communication of the cyst with the torn posterior-inferior labrum was noted.
  • The supraspinatus and infraspinatus muscles showed evidence of diffuse increased signal intensity on T2Wi and PDFS sequences suggestive of denervation edema. No evidence of atrophy or fatty changes seen.
  • No evidence of tendon tear or tendinos noted.
  • Teres minor and subscapularis muscles appeared normal.