A 29-year-old female patient complains of dyspnea, heaviness and chest pain on the right, body temperature rise up to 37,2°C. The disease is associated with a chest trauma received 4 days ago. Objectively: skin is pale and moist. Ps- 90/min., regular. Palpation reveals a dull sound on the right, auscultation reveals significantly weakened vesicular breathing. In blood: RBCs- 2,8 × 1012/l, colour index -0,9, Hb- 100 g/l, WBCs- 8,0 × 109/l, ESR - 17 mm/hour. What results of diagnostic puncture of the pleural cavity can be expected?