57 year old male, recently detected Diabetes, fever and cough for 1month, received 3 different antibiotics -coamoxyclav,levofloxacin,Cefotaxime with no clinical benefit,Sputum AFB-3 days -negative,No growth on aerobic culture.Diabetes remained poorly controlled despite being on 60 units of insulin./day.What is the DD? How will you investigsate?

DD should include - Fungal infection particularly aspergillus due to necrotization and consolidation , tubercular and bacterial process. Bronchoscopy after lateral Xray/CT thorax to map the lesion will be indicated.