Delayed diagnosis of granulomatosis with polyangiitis presenting as irregularly shaped solid lung nodules with heterogeneous enhancement: A case report

Pulmonary involvement occurs in over 90% of GPA cases, with characteristic thoracic radiologic findings including solitary or multiple nodules, masses, cavities, and consolidation, with a propensity for lesion recurrence. Clinicians should consider GPA in antibiotic-refractory "pneumonia" with unexplained extrapulmonary manifestations.