Localised re-expansion pulmonary oedema following spontaneous pneumothorax

A 53-year-old man presented to our emergency department with a 2-week history of increasing dyspnoea. The patient had a history of chronic obstructive pulmonary disease. A chest x-ray showed a right hydropneumothorax (figure). A thoracostomy was done and a right sided chest tube was connected to a negative pressure suction system; 1 h later, a repeat chest x-ray showed complete lung expansion with some right lower lobe consolidation (figure). In the next 24 h, the patient had worsening dyspnoea with hypoxaemia (oxygen saturation 86% on room air). 3 days after admission, an additional chest x-ray showed that the consolidation had resolved, with complete lung expansion (figure). Which of the following is the most likely diagnosis?