A 68-year-old woman from Delhi presents with a 2-month history of progressive dyspnea, weight loss, and low-grade fever. She has a 40-pack-year smoking history. Chest X-ray shows a right-sided pleural effusion with an ipsilateral lung mass. Pleural fluid analysis is exudative. CT chest with IV contrast is performed. Which imaging characteristic on CT would most strongly suggest malignant pleural effusion rather than benign effusion?