Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The patient is status post median sternotomy , CABG , and aortic valve replacement . The lateral view is suboptimal due to the patient 's overlying arm projecting over the posterior lung fields . On the frontal view , there is mild blunting of the right costophrenic angle , which could be due to a trace pleural effusion or pleural thickening . No left pleural effusion is seen . There is no focal consolidation or evidence of pneumothorax . The cardiac silhouette is not enlarged . The aorta is calcified and tortuous . No overt pulmonary edema is seen . There is a 0 .8 cm rounded opacity projecting over the posterior right ninth rib at the right lung base which is most likely artifactual , however , recommend oblique radiograph for further evaluation .
    OUTPUT:
    
1 . Suboptimal lateral view due to patient 's arm overlying the posterior chest . On the frontal view , there is blunting of the right costophrenic angle , may be due to a small pleural effusion versus pleural thickening . 2 . 0 .8 cm rounded opacity projecting over the posterior right ninth rib at the right lung base , however , recommend oblique radiographs for further evaluation .