Development of Multi-Organ Involvement Including a Left Atrial Myxoma-like Lesion in a Patient with Granulomatosis with Polyangiitis

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A 76-year-old woman suffering from granulomatosis with polyangitis (GPA) developed organizing pneumonia with positive antineutrophil cytoplasmic antibodies and microscopic hematuria. Prednisolone improved the hematuria and radiological findings; however, after tapering the dose of prednisolone, a posterior left atrial wall mass was detected in association with a fever. Both regressed spontaneously, although secretory otitis media and sinusitis were noted; the resected sinusitis specimen exhibited vasculitis highly suggestive of GPA. The clinical picture of GPA with multi-organ involvement can vary. Recognizing the various manifestations of GPA is therefore necessary in order to provide an appropriate diagnosis and disease management.