Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is not enlarged . Aorta is calcified and tortuous . The appearance is similar to ___ . Areas opacity at the right lung base extending to the level of the hilum , of uncertain etiology . Immediately above this there is a small amount of platelike atelectasis at the right base . Sharply defined linear lucency is seen at the right base , but the significance of this is unclear . Doubt but can not entirely exclude loculated hydro pneumothorax . There is mild prominence of vessels , but no CHF . The left lung and remaining portion of the right lung is grossly clear , without focal infiltrate or consolidation . No gross left effusion . Elsewhere , no pneumothorax identified .
    OUTPUT:
    
Unusual appearance at the right base , opacification and obscuration of the hemidiaphragm -- the etiology is uncertain , as this could relate to an elevated hemidiaphragm , atelectasis , consolidation , pleural fluid or a combination thereof . Given the sharp interface between the diaphragm and right midzone lung , is difficult to completely exclude a hydro pneumothorax , though that remains unlikely . A lateral chest x-ray would likely be helpful in better understanding the opacity at the right lung base . If feasible , a lateral decubitus view may also be helpful . Otherwise , no CHF or gross effusion . Cardiomediastinal silhouette is unchanged compared with ___ .