Clinical symptoms: 82.9% swallowing difficulty, weight loss 34.3%, increased preoperative CEA 31.4%, mean tumor size 2.6±1.2 cm (3 - 6).
Triệu chứng lâm sàng: nuốt nghẹn 82,9%, sút cân 34,3%, tăng CEA trước mổ 31,4%, kích thước u TB 2,6 ± 1,2 cm (3-6).