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Safwat Eldaabossi,1,2 Mustafa Saad,1 Mohammed Alabdullah,1 Amgad Awad,1,2 Hussain Alquraini,1 Ghada Moumneh,1 Ali Mansour1 1Almoosa Specialist Hospital, Al Ahsa, Saudi Arabia; 2Al Azhar Faculty of Medicine, Al Azhar University, Cairo, EgyptCorrespondence: Safwat Eldaabossi Email safwatchest@gmail.comBackground: Granulomatosis with polyangiitis (GPA) is an extremely rare autoimmune, necrotizing granulomatous disease of unknown etiology affecting small and medium-sized blood vessels. Chronic pulmonary aspergillosis (CPA) is a rare fungal infection with high morbidity and mortality that usually affects immunocompetent or mildly immunosuppressed patients with underlying respiratory disease. Antifungal agents (voriconazole, itraconazole) are the mainstay of therapy. Intravenous drug therapy (amphotericin B or an echinocandin), alone or in combination with azoles, is the last resort in special situations such as azole failure, resistance, or severe disease. Sometimes CPA and GPA coexist and are difficult to distinguish due to the nonspecific symptoms and similarity of clinical and radiological features, so a high degree of suspicion is required to make the correct diagnosis.Case Presentation: We reported that a 28-year-old man from Saudi Arabia was diagnosed with GPA. The patient had been complaining of cough, fatigue, polyarthralgia and red eyes for 40 days before he was admitted to our hospital. The diagnosis of GPA was confirmed by clinical and radiological examinations and a pathological report of a lung biopsy, and he was treated with immunosuppressive drugs. The patient’s condition was complicated by chronic pulmonary aspergillosis and type 2 diabetes mellitus. Initial treatments included systemic glucocorticoids, methotrexate, followed by rituximab and voriconazole, finally intravenous cyclophosphamide and amphotericin B, with no complete remission. The thoracic surgical team postponed surgical debridement of the significant cavitary lung lesions until the active fungal infection could be brought under control.Conclusion: The clinical and radiological features of GPA are similar to those of pulmonary tuberculosis, chronic pulmonary aspergillosis, and lung cancer. The lack of clear clinical symptoms of GPA requires a high degree of suspicion for early diagnosis. This case illustrates the dilemma of diagnosis and treatment of GPA and superimposed fungal infection. Secondary infection, particularly fungal infection, must be considered when GPA cannot be controlled with an immunosuppressant.Keywords: granulomatous with polyangiitis, pulmonary aspergillosis, lung abscess, vasculitis