Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable frontal chest radiograph was obtained . Lung volumes are low . Predominantly horizontal opacity in at the right base has become increasingly conspicuous since the prior studies in ___ . A retrocardiac opacity has also increased in association with decrease in lung volumes . Central pulmonary vascular congestion is mild . There is no effusion or pneumothorax . There are no new abnormal cardiac or mediastinal contours . Aortic arch calcifications are mild . The tip of a right chest Port - A - Cath terminates at the cavoatrial junction . Spinal fusion hardware is intact .
    OUTPUT:
    
1 . Central pulmonary vascular congestion . 2 . Basilar opacities likely represents a combination of central pulmonary vascular congestion and atelectasis . However a focus of infection can not be excluded in the correct clinical context .