Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . The mediastinal and hilar contours are stable including markedly enlarged pulmonary arteries and have the calcification of the aortic knob . There is no pneumothorax . The lungs are well expanded with left basilar atelectasis and possible small left pleural effusion . There is no overt pulmonary edema .
    OUTPUT:
    
Mild cardiomegaly without pulmonary edema . Chronic pulmonary hypertension . Left basilar atelectasis with possible left small pleural effusion .