How would you approach the treatment for patients with renal-limited ANCA vasculitis who have persistent proteinuria, hematuria, and ANCA titers and have completed a steroid taper and received three doses of rituximab?  

Renal limited ANCA is usually MPO associated. Isolated PR-3 involvement of the kidneys are rare. Further information is needed in making a decision for this case. We need to know when the patient was diagnosed with ANCA vasculitis. What was the Serum creatinine at presentation? When was the kidney ...