Figure 2: A case of left brachial plexus birth palsy. Image (a-f) shows MRI of brachial plexus in a three-month-old infant with a postganglionic injury and musculoskeletal abnormalities. (a) Coronal STIR image shows generalized thickening of left brachial plexus (arrow) beyond lateral border of the first rib. (b, c & d) Coronal and Axial STIR images showing diffuse swelling and increased signals involving the shoulder girdle muscles (arrows). (e) Axial STIR image shows posterior subluxation of the humeral head (arrow). (f) Sagittal T2W image shows no abnormal signal intensity lesions in the cervicothoracic spinal cord (arrows).