Free jejunum is used for reconstruction after resection of advanced head and neck cancer. Postoperative transplanted mesenteric lymph nodes swelling is often experienced, but its clinical significance is unclear. This study included patients who underwent free jejunal reconstruction at Gifu University Hospital between March 2017 and November 2023. Regarding the size change of postoperative mesenteric lymph node and risk factors, the correlation with metastasis and prognosis was investigated. This study included 51 patients, of whom 16 cases (31.4%) had postoperative mesenteric lymph node swelling and 2 cases (3.9%) had metastasis. Only two cases with metastasis showed an increase in size of 5 mm or more. Many cases without extracapsular extension and cases of salvage surgery had postoperative mesenteric lymph node swelling (p = 0.0429, p = 0.0269). No correlation was found between postoperative mesenteric lymph node swelling and prognosis. However, because all cases with metastasis were included in cases of postoperative mesenteric lymph node swelling, this could be one factor in determining whether or not metastasis occurred. The transplanted mesenteric lymph node swelling is one of the important postoperative evaluation items, and additional evaluation such as PET-CT may be recommended.
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