Concurrent granulomatous polyangiitis and squamous cell carcinoma of the lung: a case of balancing treatment.

Granulomatous polyangiitis (GPA) is a rare small-vessel vasculitis characterised by lesions in the upper respiratory tract, lungs and kidneys. Diagnosis of lung lesions can be difficult and misdiagnosis as lung cancer is not uncommon.1 Aggressive, long-term immunosuppression with drugs such as cyclophosphamide is necessary to prevent lung disease and development of end-stage renal failure.We describe a case of a 79-year-old woman with a history of previous breast malignancy who presented with a 6-month …