Patient: Description of the condition (onset time, main symptoms, hospital visited, etc.): In March 11, I found that my neck was thick and my breath was suffocated, so I went to Harbin Cancer Hospital and had a major thyroid lobe resection, right lobe resection and buccal resection on April 15. Patient: New information uploaded Chen Libo, Department of Nuclear Medicine, Shanghai Sixth People’s Hospital: Chen Libo, Department of Nuclear Medicine, Shanghai Sixth People’s Hospital Due to limited information, I can only make the following preliminary judgment: Diagnosis: postoperative follicular carcinoma of thyroid Treatment: Considering the large size of the tumor (diameter exceeds 4 cm) and the pathological type of follicular carcinoma, I think you need to undergo iodine-131 ablation, so as to achieve the following three 1. to eliminate possible occult and metastatic foci and to reduce the risk of future recurrence and metastasis; 2. after removal of the residual thyroid gland, serum thyroglobulin (Tg) will become a reliable tumor marker for follow-up disease; 3. after iodine-131 ablation, a whole-body scan will be performed to understand the distribution of iodine-131 in the body, which can detect the presence of metastasis of thyroid cancer and thus provide an accurate staging and objective assessment of the disease This will allow for accurate staging of the disease and objective assessment of the prognosis. In the past, we often encountered patients who had recurrence or metastasis after thyroid cancer surgery without timely iodine-131 ablation. For follicular carcinoma, which is very prone to metastasis, postoperative iodine-131 ablation is required regardless of the size and the presence or absence of peritoneal invasion.