Granulomatosis with polyangiitis: The trigger cannot be long hidden.

Granulomatosis with polyangiitis, or GPA, is a form of vasculitis that affects multiple organs especially the respiratory tract and the kidneys. The diagnosis is suspected with the clinical presentation and elevated serum titer of antineutrophil cytoplasmic antibodies and confirmed with the biopsy of the affected organ. Viral infection has been described as one of the triggers of the immune system in developing GPA. In this report, we describe a rare case of GPA that developed following cytomegalovirus infection in a patient with unknown immunocompromised medical condition.