Allergic bronchopulmonary aspergillosis (ABPA) is a hypersensitivity disorder induced by Aspergillus fumigatus that occurs generally in patients with underlying chronic airway disorders. However, the development of ABPA associated with lung malig-nancy remains unknown. An 80-year-old woman was admitted for evaluation of chronic cough. Her radiologic finding was a mass like opacity with mucoid impaction showing finger-in-glove sign, one of the typical radiologic findings for ABPA. In addition, laboratory test revealed that her data were satisfied with the diagnostic criteria for ABPA. Interestingly, final pathologic examination revealed that the mass lesion was small cell lung cancer. Here, we describe an interesting case of coexistent small cell lung cancer and ABPA, suggesting the possibility of accompanying lung malignancy such as small cell lung cancer should be considered in patients with ABPA.