Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Minimal patchy opacity at both lung bases could represent atelectasis . However , on the lateral view , there is patchy opacity projecting over the posterior segment of 1 of the lower lobes , which could represent a focal infiltrate . The upper and mid zones of both lungs are clear , without focal infiltrate . No CHF or effusion identified . The cardiomediastinal silhouette is stable , with mild unfolding of the aorta , but no frank cardiomegaly . Subtle , small concavity along the right border of the trachea at the level of the clavicular head is probably unchanged compared with ___ and ___ . The patient has a known multi nodular goiter and this may be related to that . On today 's exam , there is suggestion of some increased soft tissue density in this area .
    OUTPUT:
    
1 . Possible infiltrate in the posterior segment of one of the lower lobes . This is new compared with ___ and probably also ___ . 2 . Mild concavity of the right border of the trachea , not significantly changed compared with ___ , may reflect mass effect from a known multinodular goiter . However , on today 's exam , there is also suggestion of some soft tissue density in this area . Correlation with physical exam and , if indicated , repeat thyroid ultrasound is recommended . Alternatively , this area could be assessed by chest CT .