乳糜胸是食管癌术后较常见的严重并发症.多发生于术后1周以内,本文所报告9例,均发生在术后2周或2周以后,我们就术后晚期胸腔积液的性质判断(单纯性积液、癌性胸水及乳糜液)提出迟发性乳糜胸的诊断,以引起重视.对选择不同的治疗方案和病人预后的估计有重要意义. Chylothorax is a common and serious complication after esophageal cancer surgery. It usually occurs within 1 week after surgery. Nine cases of this report were reported after 2 weeks or 2 weeks after operation. We had late postoperative pleural effusion. Judgment of nature (simple effusion, cancerous pleural effusion, and chyle fluid) proposes the diagnosis of late-onset chylothorax to pay attention to. It is of great significance to select different treatment options and to estimate the prognosis of patients.