Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest film ___ at 05 :29 is submitted .
    OUTPUT:
    
Somewhat limited examination due to patient positioning . Patient 's mandible obscures the apices . Lung volumes remain dramatically diminished and the right hemidiaphragm remains elevated . Visualized lungs demonstrate streaky opacities , predominantly at the right base suggestive of atelectasis . Left axillary pacemaker is again seen but no definite lead is identified . No evidence of pulmonary edema . Overall cardiac and mediastinal contours can not be assessed due to patient positioning .