The patient’s respirations are 28/min., tachycardia is up to 100/min., there are signs of intoxication. In the area of the right scapula the percussion sound is dull, the respiration is bronchial, with single fine vesicular crackles and crepitation sounds. X-ray shows a massive inflammatory infiltration in the middle pulmonary field. Three days later, against the background of treatment, the patient developed a cough attack, during which he expectorated 200 mL of purulent sputum. After that his body temperature dropped to subfebrile values and his overall condition improved. At the level of the scapular angle, against the background of the pulmonary infiltration, there is a round area of radiolucency with the horizontal level of liquid. Make the diagnosis: