Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Right apical opacity is partially obscured by overlapping osseous structures and was better evaluated on CT . Findings on CT may have been due to aspiration , infection , or contusion . Recommend followup chest CT to assess for resolution . The patient is status post median sternotomy and CABG . Triple - lead left - sided pacemaker is again seen with leads in the expected positions of the right atrium and right ventricle . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Right apical opacity is partially obscured by overlapping osseous structures and was better evaluated on CT . Findings on CT may have been due to aspiration , infection , or contusion , given history of trauma . Recommend follow - up chest CT for further evaluation and to assess resolution / exclude an underlying pulmonary lesion .