Background: Although early diagnosis is important for selecting an effective surgical treatment for secondary lymphedema, an efficient screening test for detecting early-stage lymphedema has not yet been established. Serial changes of lymphatic function before and after lymph node dissection and risk factors for secondary lymphedema are important indicators. Methods: A prospective cohort observational study was conducted with 100 consecutive gynecologic cancer patients who underwent pelvic lymph node dissection. Lymphatic function was assessed by noninvasive lymphography using indocyanine green fluorescence imaging on a routine schedule. Earliest findings after lymphadenectomy and risk factors for lower leg lymphedema were investigated. Results: Atypical transient dermal backflow patterns were observed in an early postoperative period in 50 cases, all of which disappeared within 3 months. Of these patterns, the splash pattern was observed in 31 patients, of which five improved to normal following a natural course. In contrast, the stardust pattern was observed in 27 patients, and none had improved with conservative therapy. Postoperative radiotherapy was a significant risk factor for the stardust pattern. Conclusions: All patients who undergo lymphadenectomy for gynecologic malignancies should be examined for secondary lower extremity lymphedema by qualitative evaluation methods on a routine schedule to determine the earliest possible diagnosis. Because the splash pattern on indocyanine green lymphography is a reversible lymphatic disorder following a natural course, surgical treatments are not recommended. The decision regarding surgical treatment can be made after observing the stardust pattern. CLINICAL QUESTION/LEVEL OF EVIDENCE: Diagnostic, IV.

Background The contribution of simultaneous breast reconstruction by deep inferior epigastric artery perforator (DIEP) flap to the efficacy of vascularized groin lymph node transfer (LNT) for breast cancer-related lymphedema (BCRL) was investigated. Methods Patients were divided into two groups: the first group underwent groin LNT + DIEP flap surgery for simultaneous breast reconstruction (groin LNT + DIEP flap group) and the second group underwent groin LNT only (groin flap alone group). Patients with BCRL were evaluated based on indocyanine green lymphography findings. LNT was indicated only in advanced-stage BCRL cases, and groin nodes nourished by superficial circumflex iliac artery (SCIA) were used as donors. The side for the vascular pedicle(s) was decided based on our algorithm. In patients with pendulous breast, the flap was vertically transferred on the chest. Lymphatic function was assessed after LNT using imaging tests, and transferred lymph nodes were evaluated using ultrasonography. Results In this study, 27 patients with advanced-stage BCRL underwent LNT. Of them, 13 belonged to the groin LNT + DIEP flap group and 14 belonged to the groin flap alone group. Although reduction volume was not significantly different between the groups, the number of patients in whom lymphatic function was improved and the need for compression therapy could be reduced was significantly higher in the groin LNT + DIEP flap group than in the groin flap alone group. Conclusion When a patient with advanced-stage BCRL undergoes LNT based on SCIA, simultaneous breast reconstruction using DIEP flap may reduce the need for compression therapy.