Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There may be mild hyperinflation . Again seen is multi chamber cardiomegaly . The aortic knob is calcified and calcifications in the upper extremity are noted . There is upper zone redistribution , without overt CHF . Again seen is linear atelectasis at the left lung base . No focal infiltrate suggestive of pneumonia is identified . No pleural effusions are seen . Slight asymmetry in the degree of hyperlucency of the lungs , greater on the left , may be related to slight rotation . Mild retraction of the minor fissure is noted , but no obvious right upper lobe atelectasis is identified . Of note , there is a rounded density measuring 16 mm in the right infrahilar region . I suspect that this represents a nipple shadow . Equivocal rounded density measuring approximately ___ .5 mm overlying the right seventh anterior rib was not seen on the ___ radiograph may be an artifact due to overlap of rib shadows . Rounded lucency in the left humeral head , suggestive of osteonecrosis .
    OUTPUT:
    
1 . Multi chamber cardiomegaly , unchanged . 2 . No focal infiltrate to suggest pneumonia identified . 3 . Mild upper zone redistribution , without overt CHF . 4 . Rounded densities in the right lower zone are thought to represent a nipple shadow and artifact due to overlapping ribs . Consider repeat frontal radiograph with nipple markers to confirm this . 5 . Suspected osteonecrosis left humeral head .