MRCP2-4206
A 56-year-old man with a history of allergic rhinitis and adult onset asthma presented to the respiratory clinic with worsening breathlessness, wheezing, and abdominal pain over the past six months. Despite being on high dose inhaled corticosteroids, his asthma was no longer well controlled. He was recently admitted for acute coronary syndrome, but his coronary angiogram was normal. On examination, he had a purplish rash on his abdomen and lower extremities, and bilateral polyphonic wheezing was heard on chest auscultation. Laboratory investigations revealed elevated eosinophils, an elevated erythrocyte sedimentation rate, and positive P-ANCA. What is the most likely diagnosis?