Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A drain or other to overlies left upper quadrant . Surgical clips are noted near its tip . No free air seen beneath the diaphragm . Lordotic positioning with low inspiratory volumes . No CHF identified . There is patchy retrocardiac opacity consistent with left lower lobe collapse and / or consolidation . Lungs are otherwise grossly clear . No effusion identified . No pneumothorax detected .
    OUTPUT:
    
Patchy opacity at left lung base , compatible with left lower lobe collapse and / or consolidation .