A newborn boy presented to the neonatal intensive care unit (ICU) with dyspnoea at birth. He was born at 40+1 weeks’ gestation and weighed 2950 grams, with Apgar scores of 9 at one minute and 9 at five minutes. On examination, his left lung breath sounds were absent and bowel sounds could be auscultated in the left thoracic cage.

His respiratory rate was 70 breaths/min and there were no other deformities physically & clinically! What could be the possible diagnosis of this neonatal case?