Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a subtle rounded opacity at the right costophrenic angle . The cardiomediastinal silhouette is unremarkable . There is no pneumothorax . An oval density projecting over the left upper quadrant is of unclear etiology and may lie outside the patient . all subpulmonic effusion .
    OUTPUT:
    
Subtle opacity at the right costophrenic angle may represent overlying structures , however pulmonary consolidation can not be excluded . Small subpulmonic effusion .