Postoperative chylothorax is a rare but potentially life-threatening complication. Conservative treatment is usually unsuccessful in patients with high-output chylothorax, for whom early surgical thoracic duct ligation has been advocated to minimize morbidity and mortality. This report describes left uniportal thoracoscopic closure of persistent high-output chylothorax through Poirier's triangle in a patient undergoing thoracoscopic thymectomy. After resection of pleural adhesions, the mediastinal pleura was resected at the level of the aortic arch, left subclavian artery, and vertebral column, the anatomic limits of Poirier's triangle. The thoracic duct was then isolated from the esophagus and successfully clipped along its path.
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