Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube tip terminates 4 .5 cm from the carina . Heart size appears borderline enlarged . The aortic knob is calcified . Mediastinal and hilar contours are otherwise unremarkable . There is no pulmonary edema . Attenuation of the pulmonary vascular markings towards the apices suggest underlying emphysema . Scarring within the lung apices is noted . Streaky right basilar opacity may reflect atelectasis though infection can not be excluded . No large pleural effusion or pneumothorax is identified although the left costophrenic angle is not completely included in the field of view .
    OUTPUT:
    
1 . Standard positioning of the endotracheal tube . 2 . Right basilar streaky opacity , possibly atelectasis though infection is not excluded . 3 . Emphysema .