Increased histopathological yield for granulomatosis with polyangiitis based on nasal endoscopy of suspected active lesions

Purpose To present the results of an endoscopic and histopathologic evaluation of suspected nasal active granulomatosis with polyangiits (GPA) lesions, describe them as seen by the ENT specialist, and propose a guide for tissue sampling of the nasal cavity to improve the yield of confirmatory histology.