Review Article

Entrapment Neuropathies in the Upper and Lower Limbs: Anatomy and MRI Features

Figure 3

A high-grade sarcoma in a 28-year-old patient has MRI appearances indicating a right suprascapular nerve entrapment by the tumor at the spinoglenoid notch. Isolated increased signal intensity in the infraspinatus muscle (arrows) on axial (a) T2 fat-saturated image, with mild enhancement on coronal (b) postcontrast T1 fat-saturated image. The heterogeneous enhancing tumor produces mass effect on the supraspinatus muscle (arrowheads), which has normal signal intensity.