A 26-year-old patient with left lower lobe pneumonia experiences an acute chest pain on the left during coughing. Objectively: diffuse cyanosis, widening of the left half of chest. Percussion reveals high tympanitis. Auscultation reveals no respiratory murmurs above the left half of chest. There is a deviation of the right cardiac border towards the midclavicular line. What examination will be the most informative?