Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal semi-upright view of the chest was obtained portably . The lungs are well expanded . There is no focal consolidation or pneumothorax . Blunting of the right costophrenic sulcus may be a tiny right pleural effusion . There is mild cardiomegaly . The mediastinum is slightly widened , likely due to technique and patient position . No acute osseous abnormality is identified . There is no free air under the diaphragm .
    OUTPUT:
    
1 . No pneumonia . Possible tiny right pleural effusion . 2 . Widened mediastinum is likely due to technique and patient position . This could be reevaluated with conventional frontal and lateral radiographs , if clinically indicated .