Fig. 10

Example of extrarenal IgG4 disease. a CECT showing a rind of abnormal soft tissue (*) anterior to the right kidney and encasing the IVC. b) Axial T2 turbo spin echo image of the same patient as in Fig. 9a shows perirenal soft tissue is of low T2 signal (*). c Axial T1FS pre-contrast shows perirenal soft tissue of intermediate T1 signal (*). d Axial T1FS post-contrast arterial phase shows minimal enhancement of the perirenal soft tissue (*). e Axial T1FS post-contrast equilibrium phase shows delayed enhancement related to a cuff of soft tissue around the IVC (arrow) with most of the perirenal soft tissue remaining low T1 signal (*). f The enhancing tissue around the IVC shows restricted diffusion with high signal on DWI—B800 (arrows). g There is corresponding low signal on the ADC map (arrows)