Fig. 3
From: Nerve entrapment syndromes of the upper limb: a pictorial review
70-year-old with underwent MRI for rotator cuff tendinopathy. Sagittal proton density (PD) shoulder (a) shows severe fatty atrophy of the teres minor (white arrow). There is a lipomatous tumour with complete fat-suppression on the coronal PDFS sequence (b, yellow arrow), which is within the subscapularis muscle belly inferiorly and is impinging on the quadrilateral space and the traversing axillary nerve (a, blue arrow). This is consistent with chronic quadrilateral space syndrome