There is a right lower lobe atelectasis.
Notice the abnormal right border of the heart.
The right interlobar artery is not visible, because it is not surrounded by aerated lung but by the collapsed lower lobe, which is adjacent to the right atrium.
On a follow-up chest film the atelectasis has resolved. We assume that the atelectasis was a result of post-traumatic poor ventilation with mucus plugging.
Notice the reappearance of the right interlobar artery (red arrow) and the normal right heart border (blue arrow). #Clinical #Radiology #CXR #RLL #Lobar #Collapse #MucousPlugging #Resolution #RadiologyAssistant