Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Rotated positioning . There is increased retrocardiac density , consistent with left lower lobe collapse and / or consolidation with obscuration of the left hemidiaphragm . Probable small left effusion . Of note , there is a rounded opacity projecting immediately to the left of the expected location of the left hilum . This could relate to a parenchymal opacity , but the configuration is concerning for pulmonary artery enlargement , pulmonary artery aneurysm / pseudoaneurysm , or mass related to the left hilum . This is in keeping with findings on the ___ 18 :36 p .m . chest CT , albeit a limited CT study due to the absence of IV contrast . There is upper zone redistribution and mild diffuse vascular blurring , suggesting mild CHF . Possible trace right - sided pleural fluid . No focal infiltrate identified on the right . Upper abdominal surgical ___ noted . No pneumothorax detected . Incidental note made of surgical anchors overlying the right humerus .
    OUTPUT:
    
1 . Left lower lobe collapse and / or consolidation . 2 . Probable mild CHF . 3 . Opacity adjacent to the left hilum -- the appearance raises the question of left pulmonary artery enlargement , aneurysm / pseudoaneurysm , or left hilar mass . Please see comment above .