eFigure 3.

Magnetic resonance imaging (MRI) in cystic fibrosis. A 7-year-old girl in long-term treatment for cystic fibrosis at a pediatric pneumology center. a) Chest radiograph.

b) MRI on the same day; the patient was sedated but free breathing. The T1-weighted contrast studies show clear bronchial wall thickening and varicose bronchiectasis, most pronounced in the upper lobes (arrows), and reduced signal apically compared to basally.

c) Perfusion imaging subtraction map shows the corresponding perfusion defects of the upper fields in both lungs (arrowheads)