At CHU Sainte-Justine, approximately 80 children aged 5-7 years are seen annually and from a previous study recruiting at 5 years, participation rate was 60%, further supporting feasibility for this study. Anticipated Results and Conclusions The Investigators anticipate that there will be significantly more severe pulmonary micro-structural abnormalities, as evidenced by lower pulmonary mean signal intensity, in 7-9 year olds born at less than 28 weeks' gestation, with a history of BPD, as compared to children born at less than 28 weeks' gestation without BPD. The investigators expect that mean MRI-derived signal intensity will correlate significantly with PFT measurements, as well as with the presence of chronic respiratory symptoms and increased healthcare utilization. This is the first study using innovative MRI techniques in relation to functional testing that will help characterize regional pulmonary tissue destruction and/or emphysematous changes present in children with a history of extreme prematurity, with and without BPD. In particular, MRI measurements may be more sensitive markers of early lung disease than PFT or respiratory symptoms. Since these children may only manifest signs of respiratory impairment in the presence of stressors, knowledge of these MRI changes may prompt earlier or more aggressive respiratory support and treatment to prevent respiratory compromise. Ultimately, there may be opportunity in future to intervene with additional treatments that may halt progression to adult lung disease. This is particularly important, given the increasing body of evidence for early COPD-like disease in this group. This work may identify a BPD-COPD overlap syndrome, with unique pathophysiology and potentially differential response to treatments from traditional COPD.