There is an atelectasis of the left upper lobe.
You would not expect the apical region to be this dark, but in fact this is caused by overinflation of the lower lobe, which causes the superior segment to creep all the way up to the apical region.
This is called the luft sichel sign. #Clinical #Radiology #CXR #Lateral #LUL #Lobar #Collapse #Luftsichel #Sign #LuftsichelSign #RadiologyAssistant