Chest X-ray shows opacity after blunt trauma, most likely diagnosis is –
Amongst the given options hemothorax and pneumonia (consolidation) produce opacity on chest X-ray. Pneumonia has nothing to do with blunt chest trauma, while hemothorax is common after blunt chest trauma. Therefore, best answer here is hemothorax.
Pneumothorax causes hypertranslucency (not opacity).
Haemothorax
Pneumothorax
Pneumonia
Pulmonary embolism