Figure 16: A 12-year-old female, known case of acute lymphocytic leukemia (ALL) with perineural leukemic infiltration of BP. A, Coronal fat-suppressed T2-weighted MR image shows thickening and clumping of the infraclavicular portion of the right BP leading to loss of normal internal fascicular architecture (arrows). B, Coronal fat-suppressed post contrast T1-weighted MR image shows perineural enhancing tissue along the retro and infraclavicular portion of the right BP (arrow) suggesting leukemic deposits.