Figure 10: A 52-year-old male with focal infiltration of BP by contiguous spread from Pancoast tumour. Oblique sagittal T1-weighted MR image shows an isointense mass in the right lung apex (yellow arrow) extending to encase the right C7, C8 and T1 nerve roots (white arrows). Note the uninvolved C5 and C6 nerve roots of the BP (black arrows).