X-ray - Two months later
X-RAY Findings: Bilateral ill-defined reticulonodular markings, more prominent on the right, with obscuration of the right hemidiaphragm and heart border, positive air-bronchograms and hyperinflation of the left lower zone. No apparent atelectasis. The widened upper mediastinum on the right is most likely due to non-centric projection (see trachea and clavicles). Dilated small and large bowel loops.
Conclusion: given the history of a preterm neonate with IRDS, consecutive prolonged oxygenation therapy and normal infection parameters (normal CRP and leucocyte count), the most likely diagnosis is bronchopulmonary dysplasia (BPD).