Aortopulmonary window The aortopulmonary window is the interface below the aorta and above the pulmonary trunk and is concave or straight laterally. Here the AP-window is convex laterally due to a mass that fills the retrosternal space on the lateral view. #Clinical #Radiology #CXR #APWindow #Fullness #Convexity #AP #Window #Hodgkins #Lymphoma #RadiologyAssistant