A novel approach to the treatment of lower extremity lymphedema by transferring a vascularized submental lymph node flap to the ankle.

OBJECTIVE: Vascularized groin lymph node flaps have been successfully transferred to the wrist to treat postmastecomy upper limb lymphedema. This study investigated the anatomy, mechanism and outcome of a novel vascularized submental lymph node (VSLN) flap transfer for the treatment of lower limb lymphedema. METHODS: Bilateral regional submental flaps were dissected from three fresh adult cadavers for histological study. A unilateral submental flap was dissected in another six fresh cadavers after latex injection. The VSLN flap was transferred to the ankles of seven lower extremities in six patients with chronic lower extremity lymphedema. The mean patient age was 61 ± 9.4 years. The average duration of lymphedema symptoms was 71 ± 42.2 months. RESULTS: There was a mean of 3.3 ± 1.5 lymph nodes around the submental artery typically at the junction with the facial artery, on the six cadaveric histological sections. Mean of 2.3 ± 0.8 sizable lymph nodes were dissected and supplied by the submental artery in six cadaveric latex-injected submental flaps. All seven VSLN flaps survived. One flap required re-exploration for venous congestion but was successfully salvaged. There was no donor site morbidity. At a mean follow-up of 8.7 ± 4.2 months, the mean reduction of the leg circumference was 64 ± 11.5% above the knee, 63.7 ± 34.3% below the knee and 67.3 ± 19.2% above the ankle. CONCLUSION: The transfer of a vascularized submental lymph node flap to the ankle is a novel approach for the effective treatment of lower extremity lymphedema.

Vascularized groin lymph node flap transfer for postmastectomy upper limb lymphedema: flap anatomy, recipient sites, and outcomes.

BACKGROUND: Vascularized groin lymph node flap transfer is an emerging approach to the treatment of postmastectomy upper limb lymphedema. The authors describe the pertinent flap anatomy, surgical technique including different recipient sites, and outcome of this technique. METHODS: Ten cadaveric dissections were performed to clarify the vascular supply of the superficial groin lymph nodes. Ten patients underwent vascularized groin lymph node flap transfer for postmastectomy upper limb lymphedema using the wrist (n=8) or elbow (n=2) as a recipient site. Ten patients who chose to undergo physical therapy were used as controls. Intraoperatively, indocyanine green was injected subcutaneously on the flap margin to observe the lymph drainage. Outcomes were assessed using improvement of circumferential differentiation, reduction rate, and decreased number of episodes of cellulitis. RESULTS: A mean 6.2±1.3 groin lymph nodes with consistent pedicles were identified in the cadaveric dissections. After indocyanine injection, the fluorescence was drained from the flap edge into the donor vein, followed by the recipient vein. At a mean follow-up of 39.1±15.7 months, the mean improvement of circumferential differentiation was 7.3±2.7 percent and the reduction rate was 40.4±16.1 percent in the vascularized groin lymph node group, which were statistically greater than those of the physical therapy group (1.7±4.6 percent and 8.3±34.7 percent, respectively; p<0.01 and p=0.02, respectively). CONCLUSIONS: The superficial groin lymph nodes were confirmed as vascularized with reliable arterial perfusion. Vascularized groin lymph node flap transfer using the wrist or elbow as a recipient site is an efficacious approach to treating postmastectomy upper limb lymphedema. CLINICAL QUESTION/LEVEL OF EVIDENCE: Therapeutic, III.