In this case, laboratory findings revealed elevated serum levels of KL‐6, SP‐D, and autoimmune markers (antinuclear antibody, and anti‐SS antibody types A and B); thus, the differential diagnosis included connective‐tissue diseases, especially SS whose pulmonary manifestation may present as bronchiectasis and cystic change4 and they are the most mimics of lung cavities.5 This evidence concerns the gene MUC1 and bronchiectasis.