Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . The heart is moderately enlarged though unchanged . The aorta appears calcified and unfolded . Retrocardiac space is suboptimally assessed . Allowing for low lung volumes , the right lung is clear . PEG tube projects over the upper abdomen on the left . No pneumothorax . No right effusion . No large left effusion . Bony structures are intact with degenerative changes again noted at the right shoulder .
    OUTPUT:
    
Stable cardiomegaly . No convincing evidence for pneumonia the retrocardiac space is not well assessed .