At this stage clinical and radiological findings raised suspicion of CF; therefore, our patient underwent a sweat test, which exhibited clear positive values (a Na+ of 103 mEq/L and Cl- 94 mEq/L) and a molecular test with deoxyribonucleic acid (DNA) extraction and analysis of CFTR gene mutations confirming disease (genotype DeltaF508/DeltaF508). Here, CFTR is linked to cystic fibrosis.