Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged , unchanged . The mediastinal contour is similar with mild tortuosity of the thoracic aorta again noted . Bilateral hilar enlargement is unchanged likely reflective of enlargement of the pulmonary arteries and suggestive of pulmonary arterial hypertension . Pulmonary vasculature is not engorged . Patchy opacity in the left lung base likely reflects atelectasis , without focal consolidation . No pleural effusion or pneumothorax is present . Compression deformity in the upper lumbar spine is unchanged . No acute osseous abnormalities detected .
    OUTPUT:
    
Left patchy opacity , likely atelectasis . Unchanged bilateral pulmonary artery enlargement suggestive of underlying pulmonary arterial hypertension .