Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There relatively low lung volumes . No definite focal consolidation is seen . No pleural effusion or pneumothorax is seen . The cardiac silhouette is top - normal to mildly enlarged . Mediastinal contours are slightly prominent which may relate to AP technique with low lung volumes . There is central pulmonary vascular engorgement without overt pulmonary edema .
    OUTPUT:
    
Central pulmonary vascular engorgement without overt pulmonary edema . Mildly prominent superior mediastinum may relate AP technique and low lung volumes . If clinical concern for acute mediastinal process , consider CT .