Pulmonary overlap syndrome in a patient with bronchial asthma.

Allergic bronchopulmonary aspergillosis (ABPA) is a disease of immunocompetent patients, and invasive pulmonary aspergillosis is seen in immunocompromised patients. Hence, pulmonary overlap syndrome presenting with ABPA and invasive aspergillosis is extremely rare. We report a case of well-controlled bronchial asthma who presented with acute exacerbation and hypoxaemic respiratory failure.