Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Unchanged mild cardiomegaly . Normal mediastinal and hilar contours . Unchanged thoracic scoliosis . Blunting of the left costophrenic angle suggests a small left pleural effusion with underlying atelectasis and possible superimposed pneumonia . No definite soft tissue abnormalities .
    OUTPUT:
    
Given the clinical history , there is concern for left lower lobe pneumonia .