A case of ureteral lymphoma with no other areas of involvement was inc
identally discovered on MRI examination. Bilateral ureteral soft tissu
e infiltration, asymmetrical hydronephrosis, and abnormal enhancement
of lymphomatous tissue were noted. A follow-up MRI after chemotherapy
demonstrated significant decrease in the size of the periureteral dise
ase and improvement in the extent of hydronephrosis.