Fig. 4

Magnetic resonance imaging scans of the pelvis obtained before and after her initial course of treatment. (i) Axial post-contrast fat-saturated T1WI and (ii) Sagittal T2WI show a significant reduction in the volume of soft tissue within the left hemipelvis (blue circles) and presacral space (yellow arrows). (iii) Axial post-contrast fat-saturated T1WI shows residual but less extensive enhancing soft tissue along the sacral nerve roots (green arrows). This is seen to continue to involve the exiting nerve roots, lumbosacral plexus and sciatic nerve—the thickness of these are, however, reduced. (iv) Axial T2WI shows reduced-volume left iliac chain lymphadenopathy (blue arrows)