A 58-year-old man with known cirrhosis presents with progressive dyspnea over 2 weeks. Chest X-ray shows a completely opacified right hemithorax with mediastinal shift away from the affected side, as marked by **A** in the diagram. Thoracentesis yields a clear, straw-colored fluid with total protein 2.1 g/dL (serum 6.8 g/dL) and LDH 180 U/L (serum 320 U/L). Which of the following best explains the pathophysiology of the pleural fluid accumulation in this patient?