The retracted visceral pleura is seen (blue arrow) which indicates that there is a pneumothorax. There is a horizontal line visible (yellow arrow). Normally there are no straight lines in the human body unless when there is an air-fluid level. This means that there is a hydro-pneumothorax. When a pneumothorax is small, this air-fluid level can be the only key to the diagnosis of a pneumothorax. #Clinical #Radiology #CXR #Pneumothorax #Hydropneumothorax #RadiologyAssistant
