Figure 2A-2C: Normal MR imaging planes and appearance of BP. A-C, Acquisition of the oblique sagittal plane with fat-suppressed T2-weighted and T1-weightedimages from medial to lateral show the normal segmental anatomy of BP. The coronal plane is used to plan oblique sagittal images, the oblique sagittal imagesare acquired perpendicular to the long axis of the plexus from spinal cord to the medial border of head of the humerus (A) depicting the cross-section of the plexusmore accurately than true sagittal imaging. The nerve plexus is seen as uniform calibre of small, slightly hyperintense on fat-suppressed T2-weighted and isointenserounded structure on T1-weighted images. At the level of interscalene triangle, oblique sagittal fat-suppressed T2-weighted (B) image shows the ventral rami (whitearrows) from C5 to T1 in between the anterior scalene muscle (star) anteriorly and middle scalene muscle (open arrow) posteriorly, on T1-weighted (C) image, thesenerve roots (arrow), are seen in the interscalene triangle (as shown) in between the anterior (ASM) and middle (MSM) scalene muscles and superior to subclavianartery (SA).