# Unexpected Relapse: Insights Into Granulomatosis With Polyangiitis

## TL;DR

This paper presents a rare case of Granulomatosis with Polyangiitis relapse 38 years after initial diagnosis, emphasizing the need for complete immunological recovery to prevent further organ damage.

## Contribution

The novelty lies in reporting the first documented GPA relapse after nearly four decades, highlighting long-term management implications.

## Key findings

- A GPA patient experienced a relapse 38 years after initial diagnosis with lung involvement.
- The patient showed acute kidney injury and uremia but achieved renal recovery after treatment.
- Complete immunological recovery is crucial to prevent GPA relapse and preserve organ function.

## Abstract

Granulomatosis with polyangiitis (GPA) is a rare vasculitis that can pose a significant mortality risk given its multiorgan involvement and is the most common of the three anti-neutrophil cytoplasmic antibodies (ANCA)-associated vasculitides. Cardinal pathological features include necrotizing granulomas of the respiratory tract, small and medium vessel vasculitis, and glomerulonephritis. Early treatment is imperative to reduce permanent organ damage such as end-stage kidney disease. We describe the first case of GPA relapse 38 years after the initial pulmonary presentation. The patient previously had isolated lung involvement with preserved renal function, but presented with an acute kidney injury, uremia, and several constitutional symptoms. The patient was treated with corticosteroids and intermittent hemodialysis and initiated on immunosuppressants; the clinical course is highlighted by eventual renal recovery. Our purpose is to highlight the importance of treating patients to complete immunological recovery, particularly in GPA vasculitis, to prevent unnecessary relapse and further loss of renal function.