Ureteral obstruction caused by vasculitis.

We report 2 cases of ureteral obstruction caused by vasculitis (polyarteritis nodosa and systemic lupus erythematosus). Case 1, in which the diagnosis was unknown preoperatively, was managed surgically with ureteral resection and reimplantation. Case 2 was managed medically with chlorambucil and corticosteroids, which resulted in resolution of ureteral obstruction.