Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable semi-erect chest film ___ at 08 : 13 is submitted .
    OUTPUT:
    
Persistent patchy opacity at the left base most likely reflects slightly worsening left lower lobe atelectasis , although superimposed pneumonia or aspiration can not be excluded . Possible layering left effusion . Calcified nodule in the left upper lobe consistent with prior granulomatous infection . No evidence of pulmonary edema . Overall stable cardiac and mediastinal contours given patient rotation on the current study . No pneumothorax .