Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates low lung volumes and unchanged cardiomegaly . No definite focal consolidation or pneumothorax is identified , although evaluation is limited secondary to obscuration of the right apex . There is minimal , if any , pleural fluid on the left . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Limited exam secondary to patient positioning and low lung volumes . Within these limitations , no acute cardiopulmonary process .