Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Low lung volumes somewhat limit assessment . There is no focal consolidation , effusion , or pneumothorax . The cardiomediastinal silhouette is unchanged with mild to moderate cardiomegaly . Imaged osseous structures are intact .
    OUTPUT:
    
Cardiomegaly , otherwise unremarkable .