What are the CT and MRI features of urothelial cancers of the upper urinary tract?
Synchronous or metachronous urothelial malignancies occur in ≈5% of patients with a history of bladder cancer. The lesions are seen as filling defects or mucosal irregularities in the collecting system or ureter on a CT urogram, MR urogram, or intravenous urogram. Associated regional lymphadenopathy or distant metastatic disease may also be present. If the lesion invades the renal parenchyma, differentiation from a primary renal parenchymal neoplasm such as RCC is important, because the treatment of urothelial cancer of the kidney usually requires a complete nephroureterectomy.