Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable AP chest radiograph was obtained . Low lung volumes accentuate vascular markings . Despite these limitations , there is no obvious consolidation . No effusion or pneumothorax is present . Cardiac silhouette is exaggerated by AP technique and low lung volumes . Mild increase in heart size can not be excluded due to differences in technique .
    OUTPUT:
    
Apparent enlargement of the cardiac silhouette is most likely related to technique . No acute cardiopulmonary process .