A Rare Case of Allergic Bronchopulmonary Aspergillosis With Endobronchial Aspergilloma Causing Total Lung Collapse

We present a rare case of allergic bronchopulmonary aspergillosis (ABPA) with endobronchial aspergilloma in a 70-year-old man who presented with acute total collapse of the left lung. Initial imaging raised concern for malignancy, but bronchoscopy revealed a fungal ball obstructing the left main bronchus. Serological markers confirmed ABPA. Treatment with bronchoscopy-guided clearance, oral corticosteroids, and voriconazole led to complete clinical and radiological recovery. This case highlights the importance of considering fungal aetiologies in atypical presentations of lung collapse.