Granulomatosis with polyangiitis with rapidly progressive glomerulonephritis treated with a multipronged approach-a case based review.

Granulomatosis with polyangiitis is an ANCA-associated vasculitis that involves small to medium-sized vessels. The extent of renal involvement varies, which is also associated with disease prognosis, with aggressive renal involvement having worse outcomes. Rapidly progressive glomerulonephritis with severe inflammatory features and extensive crescent formation can be challenging to treat. Usually, induction regimes utilize a combination of pulse dose methylprednisolone followed by rituximab or cyclophosphamide. Resistant diseases pose additional treatment challenges, and individualized treatment regimens have been described without accumulated outcome data. Cyclophosphamide, rituximab, azathioprine, methotrexate, and mycophenolate with or without plasmapheresis have been variably used, but there is a lack of consensus on a standardized regime in literature. Our case adds to the existing literature on the treatment-refractory granulomatosis with polyangiitis, which was treated with high-dose corticosteroid in combination with rituximab, low-dose cyclophosphamide, plasmapheresis, and brief use of hemodialysis. It also reiterates that the use of a variety of low-dose cyclophosphamide with rituximab could be beneficial for treatment-refractory cases or patients with severe renal involvement, in addition to better tolerance with low dose cyclophosphamide in comparison with full-dose cyclophosphamide.