“In conclusion, this study revealed the radiologic characteristics of IgG4-related lesions involving the upper urinary tract compared with those of urothelial carcinoma. CT findings suggestive of IgG4-related upper urinary tract lesions in comparison with urothelial carcinoma are bilateral and have longer urinary tract involvement; extramural growth pattern; ill-defined margins; a gradual enhancement pattern in the dynamic CT study; aortic involvement; and fat stranding in the paraaortic space, presacral space, or pelvic wall areas. IgG4-related disease can also manifest as unilateral lesions, which could appear similar to those of urothelial carcinoma and be difficult to differentiate.”
CT Findings of Upper Urinary Tract Lesions in IgG4-Related Disease: Comparison With Urothelial Carcinoma
Minobu Kamo et al.
AJR 2020; 215:406–412

“CT findings suggestive of IgG4-related upper urinary tract lesions in comparison with urothelial carcinoma are bilateral and have a longer urinary tract involvement and exhibit an extramural growth pattern, ill-defined margins, a gradual enhancement pattern, aortic involvement, and fat stranding in the paraaortic, presacral, or pelvic wall areas.”
CT Findings of Upper Urinary Tract Lesions in IgG4-Related Disease: Comparison With Urothelial Carcinoma
Minobu Kamo et al.
AJR 2020; 215:406–412