Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: While there is mild cardiomegaly . The patient is status post CABG with sternal wires and mediastinal clips . The right hemidiaphragm is mildly elevated and there is crowding at the right base . It is unclear if the opacity in this region is due to volume loss or infiltrate . The left lung is clear . There is mild pulmonary vascular redistribution .
    OUTPUT:
    
Opacity at the right base could be due to volume loss or early infiltrate .