3R Technique — SCIP Lymphatic Flap Transfer (SCIP-LFT) for Male Genital Elephantiasis
The Radical Reduction and Reconstruction (3R) technique developed by Yamamoto et al. is a one-stage curative approach for end-stage male genital elephantiasis (MGE) that combines radical excision of all fibroadipose tissue with simultaneous lymphatic reconstruction using a pedicled SCIP lymphatic flap transfer (SCIP-LFT) — transferring intact superficial lymphatic vessels plus their draining inguinal lymph nodes on the SCIA pedicle. In the index series (n = 7) the technique achieved 0% complications, 0% recurrence, and no postoperative compression at mean 22.7-month follow-up.[1]
For the broader condition see Genital Lymphedema and Giant Penoscrotal Lymphedema. For conservative anchor see Complex Decongestive Therapy; for the early-stage microsurgical alternative see Lymphaticovenous Anastomosis; for free-flap LN transfer see Vascularized Lymph Node Transfer; for purely excisional debulking see Modified Charles Procedure and Debulking Scrotoplasty.
Concept and Rationale
Excisional procedures remove diseased tissue but do not restore lymphatic transport, leaving patients exposed to recurrence, lymphorrhea, and cellulitis. The 3R approach addresses both problems in a single operation:[1]
| R | Objective |
|---|---|
| Radical | Complete resection of all fibrotic / elephantiasis tissue (mean 1,511 g; range 609–2,304 g) |
| Reduction | Debulking to restore normal genital contour and function |
| Reconstruction | Soft-tissue and lymphatic structure reconstruction via SCIP-LFT |
The key innovation is that the SCIP-LFT provides not only soft-tissue coverage but functional lymphatic reconstruction — transferring a complete lymphatic unit (afferent lymphatic vessels + draining lymph nodes), thereby targeting the recurrence that plagues purely excisional approaches.[1]
Vascular Anatomy of the SCIP Flap
The superficial circumflex iliac artery (SCIA) arises from the femoral artery and bifurcates into two branches:[2][3]
| Branch | Course | Surgical relevance |
|---|---|---|
| Superficial (SCIAs) | Above deep fascia, laterally toward ASIS | Supplies groin / lower abdomen skin; dermal-plexus perforators enable superthin flap harvest[4] |
| Deep (SCIAd) | Between sartorius and TFL beneath deep fascia | Branches to sartorius muscle and iliac bone — enables chimeric (osteo / myo) designs[2] |
| Transverse (SCIAt) | Arises ~25 mm below ASIS | Reliable landmark for identifying the deep branch[7] |
Key anatomical landmarks:
- The SCIAs / SCIAd bifurcation point lies within 2 cm of a fixed site: 6 cm from the pubic tubercle toward the ASIS, 3 cm caudal from that point (85% of specimens).[2]
- The SCIAs exit point through Hesselbach's fascia is within a 21-mm radius circle centered 18 mm medial and 17 mm distal to the ASIS in 90% of patients.[6]
- In 91.9% of cases the SCIAs demonstrates an axial pattern extending cephalically beyond the ASIS.[5]
Venous drainage is via the SCIV and accompanying venae comitantes; the SCIV may form a common trunk with the SIEV.[8]
Lymphatic Anatomy — What Makes SCIP-LFT Different from a Standard SCIP
The deliberate inclusion of lymphatic structures distinguishes SCIP-LFT from a conventional SCIP flap:
- The groin contains superficial inguinal lymph nodes draining the lower abdominal wall, perineum, and lower extremity.
- Afferent lymphatic vessels course within the subcutaneous tissue alongside the SCIA branches, converging on these nodes.
- By harvesting perinodal fat and associated lymphatic channels intact, the flap transfers a complete functional lymphatic unit — nodes plus their afferent vessels.[9][10]
This combined node + vessel transfer has been formalized as Lymphatic System Transfer (LYST), conceptually merging VLNT (node transfer) and VLVT (vessel transfer). The inclusion of long afferent lymphatic vessels with their draining nodes may reduce the neolymphangiogenesis required for physiological function — potentially yielding earlier functional recovery than traditional VLNT.[9][10]
Surgical Technique (Yamamoto 3R)
Preoperative planning
- ICG lymphography of the groin to map superficial lymphatic vessels and identify channels to be included in the SCIP-LFT.[1]
- Preoperative ultrasound mapping to identify SCIA perforators — color-coded duplex sonography achieves 100% correlation with intraoperative anatomy.[11]
- Assessment of disease extent to decide between scrotal-only versus combined penoscrotal reconstruction.
Step 1 — Radical resection of elephantiasis tissue
- Complete excision of all genital fibrotic / lymphedematous tissue.
- Resected weight in the index series 609–2,304 g (mean 1,511 g).[1]
- Testes, spermatic cords, and urethra are carefully preserved.
Step 2 — SCIP-LFT harvest (proximal-to-distal dissection)
Using the proximal-to-distal dissection technique of Yoshimatsu and Yamamoto:[12]
- Proximal incision at the groin crease — identify the SCIA origin from the femoral artery.
- Identify the superficial / deep branch bifurcation.
- Proceed proximal-to-distal — unlike traditional distal-first SCIP harvest, this approach allows:
- Inclusion of variable chimeric components (lymph nodes, lymphatic vessels, fascia, muscle, bone).[12]
- Better control of the vascular pedicle.
- Flap design based on the actual vascular anatomy encountered.
- Deliberate inclusion of lymphatic structures — perinodal fat, superficial inguinal lymph nodes, and afferent lymphatic vessels are preserved within the flap.
- The flap remains pedicled on the SCIA / SCIV and is rotated into the scrotal defect without microsurgical anastomosis.[1]
Step 3 — Scrotal reconstruction with SCIP-LFT
- Pedicled full-thickness SCIP-LFT rotated into the scrotal defect to reconstruct the neoscrotum.
- Provides both soft-tissue coverage (thin pliable skin mimicking native scrotum) and functional lymphatic drainage.
- Testes enveloped within the neoscrotum.
Step 4 — Penile reconstruction (when needed)
In combined penoscrotal disease (3/7 in the index series), a separate SCIP pure-skin-perforator flap is used for penile skin reconstruction — a second thinner SCIP component on a distinct perforator from the same SCIA system (chimeric design). The penile flap provides thin pliable coverage without lymphatic components (the penis requires skin coverage, not lymphatic reconstruction).[1]
Step 5 — Donor site closure
- Primary closure of all donor sites — no skin grafting required.[1]
- Concealed groin-crease scar within the natural skin fold.[13]
Key Technical Innovations
| Innovation | Detail |
|---|---|
| Pedicled (not free) flap | Eliminates microsurgical anastomosis; 100% flap survival; broadens access beyond microsurgical centers[1][10] |
| No postoperative compression | Unique among genital-lymphedema operations — restoration of lymphatic drainage by the SCIP-LFT eliminates need for compression therapy[1] |
| One-stage curative intent | Single operation addresses both volume problem (radical excision) and underlying lymphatic dysfunction (LFT)[1] |
| Chimeric versatility | Proximal-to-distal elevation enables multiple tissue components on a single SCIA pedicle[12] |
Chimeric SCIP components available on the SCIA system
| Component | Vascular source | Application in 3R |
|---|---|---|
| Skin / fat paddle | SCIAs or SCIAd perforators | Scrotal skin reconstruction[1] |
| Lymph nodes + afferent vessels | Perinodal tissue along SCIA | Lymphatic drainage restoration[1][2] |
| Pure-skin-perforator flap | Separate SCIAd perforator | Penile skin reconstruction[1] |
| Sartorius muscle | SCIAd branches | Dead-space obliteration if required[2] |
| Deep fascia | SCIAd | Structural support if required[14] |
| Iliac bone (osteocutaneous) | SCIAd | Not used in genital reconstruction[15][22] |
Outcomes — Yamamoto 3R Series (n = 7)
| Parameter | Result |
|---|---|
| Patients | 7 (4 isolated scrotal, 3 penoscrotal elephantiasis) |
| Mean resected tissue | 1,511 g (range 609–2,304) |
| Flap type | Pedicled full-thickness SCIP-LFT (all 7); + SCIP pure-skin-perforator for penis (3/7) |
| Flap survival | 100% |
| Postoperative complications | Zero (no dehiscence, infection, hematoma, seroma) |
| Recurrence | Zero at mean 22.7 mo |
| Genital Lymphedema Score | 6.7 ± 1.8 → 0.3 ± 0.5 (p < 0.001) |
| Postoperative compression | Not required |
| Donor closure | Primary in all cases |
Outcomes — Abdelfattah Series (n = 26, Largest SCIP-LFT Genital Series)
Abdelfattah et al. applied the SCIP-lymphatic pedicled flap concept to the largest published cohort:[16]
| Parameter | Result |
|---|---|
| Patients | 26 (15 isolated scrotal, 11 penoscrotal) |
| Mean age | 39 ± 4.6 y |
| Mean follow-up | 44.9 mo (longest for any SCIP-LFT genital series) |
| Reconstruction type | Partial scrotum 11, total scrotum 15, total penile skin 9, partial penile skin 2 |
| Flap survival | 100% |
| Cellulitis reduction | Significant (p < 0.001) |
| Genital Lymphedema Score | 6.2 → 0.05 (p < 0.001) |
| Glasgow Benefit Inventory | Median +41; 100% improved |
| QOL improvement | 100% of patients |
| Sexual function | Improved |
LYST — Conceptual Evolution of SCIP-LFT
The SCIP-LFT used in the 3R technique has been formalized into the broader Lymphatic System Transfer (LYST) concept and applied beyond genital lymphedema to extremity disease:[9][10]
| Feature | Traditional VLNT | SCIP-LYST |
|---|---|---|
| What is transferred | Lymph nodes only (within perinodal fat) | Nodes + afferent lymphatic vessels |
| Mechanism | Relies on neolymphangiogenesis | Transferred vessels provide immediate channels; nodes stimulate additional lymphangiogenesis |
| Neolymphangiogenesis requirement | High — new vessels grow from scratch | Reduced — pre-existing transferred vessels bridge the gap |
| Onset of improvement | Gradual (12+ mo) | Potentially earlier functional recovery |
| Pedicled option | Rarely possible (most VLNT requires free flap) | Pedicled SCIP-LYST eliminates microsurgical anastomosis |
Long-term LYST outcomes (Yoshimatsu et al., 8 patients, mean 39 mo):[9]
- Mean improvement in excess volume percentage 11.2% (p < 0.001).
- Mean 15-point reduction in LLIS score (0.5 points / week).
- Mean 30-unit decrease in L-Dex bioimpedance (0.9 units / week).
- Zero immediate complications.
- Pedicled SCIP-LYST may specifically benefit patients with concomitant venous disease — flap lymphatics drain efferent to the site of venous obstruction.[10]
A perforator-to-perforator SCIP-based vascularized lymph node + lymph vessel transfer has also been described, with intraoperative ICG confirmation of lymphatic flow direction at the recipient site.[17]
Prophylactic Application — L-SCIP After Groin Dissection
The lymphatic SCIP flap has been applied prophylactically to prevent lymphedema after inguinal lymphadenectomy. Caretto et al. performed immediate inguinal reconstruction with an L-SCIP flap in 31 patients undergoing bilateral groin dissection for vulvar cancer:[18]
- Mean volume variation 479 ± 330 cc³ on the reconstructed side vs 683 ± 425 cc³ on the contralateral (non-reconstructed) side (p = 0.022).
- Lymphoscintigraphy confirmed reduced lymphedema on the treated side.
The same principle is directly applicable to urologic oncology — pelvic lymphadenectomy for penile, bladder, or prostate cancer — to prevent secondary genital and lower-extremity lymphedema.
SCIP Properties That Suit Genital Reconstruction
| Property | Clinical advantage |
|---|---|
| Thin and pliable | Mimics native scrotal skin; avoids bulkiness of musculocutaneous flaps[13] |
| Consistent vascular anatomy | Reliable harvest with predictable perforator locations[2][3] |
| Pedicled reach to perineum | Groin-crease location allows direct rotation to scrotum / perineum without microsurgery[1][13] |
| Primary donor closure | 100% primary closure; concealed scar in groin crease[1][13] |
| Chimeric versatility | Lymph nodes, vessels, muscle, fascia, bone on a single pedicle[12] |
| Minimal donor morbidity | No functional deficit; no donor-site LE with ipsilateral harvest[4] |
| Large skin paddle | Up to 22 × 10 cm pedicled; up to 355 cm² free[20] |
| Propeller rotation | Up to 180° on its perforator for optimal positioning[19] |
Complications and Donor-Site Morbidity
| Outcome | Rate / detail |
|---|---|
| Yamamoto 3R series complications | 0/7[1] |
| Abdelfattah SCIP-LFT flap survival | 100% (n = 26)[16] |
| Pedicled SCIP for Fournier's (genital recipient) | All flaps survived (n = 3)[13] |
| General SCIP flap survival | 95.5–100% across series[14][20] |
| Partial necrosis | 3.5% (2/57 SCIP-t series — managed conservatively)[20] |
| Total flap loss | 2.6% (2/77 venous-drainage study)[8] |
| Donor-site complications | ~9% minor, managed conservatively; no functional deficits[14] |
| Donor-site lymphedema | None with ipsilateral genital-recipient harvest[4] |
LFCN preservation — the lateral femoral cutaneous nerve runs near the SCIP harvest site. In the Yamamoto SCIP-t series, all 57 flaps were elevated with LFCN preservation;[20] the propeller SCIP series similarly emphasizes LFCN preservation to avoid thigh dysesthesia.[19]
Comparison — 3R / SCIP-LFT vs Other Genital-Lymphedema Operations
| Feature | Excision + primary closure | Modified Charles (excision + STSG) | Excision + flap | Free VLNT into scrotum | 3R / SCIP-LFT |
|---|---|---|---|---|---|
| Lymphatic restoration | None | None | None | Yes (neolymphangiogenesis) | Yes (LYST — vessels + nodes) |
| Recurrence | 10–50% | Variable | Variable | 0% at 49 mo | 0% at 22.7–44.9 mo |
| Complication rate | ~10% | Variable | 54.2% (Guiotto) | Low | 0% (Yamamoto) |
| Flap survival | n/a | n/a | Variable | 93–100% | 100% |
| Postoperative compression | Required (lifelong) | Required | Required | Required | Not required |
| Microsurgery required | No | No | No | Yes (free flap) | No (pedicled) |
| One-stage | Yes | Yes | Usually | Sometimes | Yes |
| Donor-site morbidity | Minimal | STSG donor | Thigh-flap donor | Donor-LE risk | Minimal; concealed scar |
| QOL improvement | Variable | Variable | Variable | 100% | 100% |
Indications and Patient Selection
- Giant / end-stage male genital elephantiasis (ISL Stage III) — primary indication.
- Isolated scrotal elephantiasis — pedicled full-thickness SCIP-LFT for neoscrotum.
- Combined penoscrotal elephantiasis — SCIP-LFT for scrotum + SCIP pure-skin-perforator for penis.
- Failed CDT with irreversible fibroadipose changes.
- Patients in whom postoperative compression adherence is a concern.
- Patients who are not candidates for microsurgery.
Limitations / contraindications:
- Requires intact SCIA vascular anatomy — prior groin surgery may compromise the pedicle.
- Limited to patients with adequate groin tissue for flap harvest.
- Requires expertise in perforator flap surgery and lymphatic anatomy.
- Long-term data beyond ~45 mo remain limited.
Key Takeaways
- The 3R technique combines radical excision with functional lymphatic reconstruction in a single operation for end-stage MGE.[1]
- SCIP-LFT transfers a complete lymphatic system (afferent vessels + draining nodes), not nodes alone — the LYST concept may yield earlier functional recovery than traditional VLNT.[9][10]
- Zero complications and zero recurrence in the index series; 100% flap survival and 100% QOL improvement in the largest cohort.[1][16]
- The pedicled nature eliminates the need for microsurgical anastomosis — broadening access compared with free VLNT.[1][10]
- No postoperative compression required — unique among genital-lymphedema operations.[1]
- The SCIP flap is thin, pliable, and ideally suited for scrotal reconstruction, with primary donor closure and a concealed groin-crease scar.[13]
- The same L-SCIP concept can be applied prophylactically during inguinal / pelvic lymphadenectomy — directly applicable to urologic oncology.[18]
- Proximal-to-distal elevation enables chimeric designs that address both scrotal and penile reconstruction in a single operation.[1][12]
References
1. Yamamoto T, Daniel BW, Rodriguez JR, et al. Radical reduction and reconstruction for male genital elephantiasis: superficial circumflex iliac artery perforator (SCIP) lymphatic flap transfer after elephantiasis tissue resection. J Plast Reconstr Aesthet Surg. 2022;75(2):870–880. doi:10.1016/j.bjps.2021.08.011
2. Yoshimatsu H, Steinbacher J, Meng S, et al. Superficial circumflex iliac artery perforator flap: an anatomical study of the correlation of the superficial and the deep branches of the artery and evaluation of perfusion from the deep branch to the sartorius muscle and the iliac bone. Plast Reconstr Surg. 2019;143(2):589–602. doi:10.1097/PRS.0000000000005282
3. Gandolfi S, Postel F, Auquit-Auckbur I, et al. Vascularization of the superficial circumflex iliac perforator flap (SCIP flap): an anatomical study. Surg Radiol Anat. 2020;42(4):473–481. doi:10.1007/s00276-019-02402-9
4. Zhang Y, Zeng A. An easy way to harvest a superthin SCIP flap with long pedicle: reappraisal of the inferolateral branches of the SCIA. Plast Reconstr Surg. 2023;152(5):1100–1104. doi:10.1097/PRS.0000000000010338
5. Jeong HH, Zaman SR, Oh SM, et al. Visualization of superficial circumflex iliac artery perforator flap pedicle with ultrasound: revealing the concept of pedicle axiality. Plast Reconstr Surg. 2026. doi:10.1097/PRS.0000000000012902
6. Fernandez-Garrido M, Nunez-Villaveiran T, Zamora P, Masia J, Leon X. The extended SCIP flap: an anatomical and clinical study of a new SCIP flap design. J Plast Reconstr Aesthet Surg. 2022;75(9):3217–3225. doi:10.1016/j.bjps.2022.06.021
7. Yoshimatsu H, Yamamoto T, Hayashi A, et al. Use of the transverse branch of the superficial circumflex iliac artery as a landmark facilitating identification and dissection of the deep branch of the superficial circumflex iliac artery for free flap pedicle: anatomical study and clinical applications. Microsurgery. 2019;39(8):721–729. doi:10.1002/micr.30518
8. Jeong HH, Tonaree W, Kang HI, et al. Venous drainage pattern of superficial circumflex iliac artery perforator (SCIP) flap: implications for surgical planning and outcomes. Plast Reconstr Surg. 2026. doi:10.1097/PRS.0000000000013063
9. Yoshimatsu H, Cho MJ, Karakawa R, et al. The role of lymphatic system transfer (LYST) for treatment of lymphedema: a long-term outcome study of SCIP flap incorporating the lymph nodes and the afferent lymphatic vessels. J Plast Reconstr Aesthet Surg. 2025;101:15–22. doi:10.1016/j.bjps.2024.11.052
10. Xu KY, Finkelstein ER, Wu S, Tadisina K, Mella-Catinchi J. Lymphatic system transfer (LYST) with pedicled SCIP for patients with lymphedema and concomitant chronic venous disease. Plast Reconstr Surg. 2026. doi:10.1097/PRS.0000000000012927
11. Schiltz D, Lenhard J, Klein S, et al. Do-it-yourself preoperative high-resolution ultrasound-guided flap design of the superficial circumflex iliac artery perforator flap (SCIP). J Clin Med. 2021;10(11):2427. doi:10.3390/jcm10112427
12. Yoshimatsu H, Yamamoto T, Hayashi A, Iida T. Proximal-to-distally elevated superficial circumflex iliac artery perforator flap enabling hybrid reconstruction. Plast Reconstr Surg. 2016;138(4):910–922. doi:10.1097/PRS.0000000000002607
13. B S, Khanna A, Taylor D. Pedicled superficial circumflex iliac artery perforator (SCIP) flap for perineo-scrotal reconstruction following Fournier's gangrene. ANZ J Surg. 2023;93(1–2):276–280. doi:10.1111/ans.18066
14. Scaglioni MF, Meroni M, Fritsche E, Rajan G. Superficial circumflex iliac artery perforator flap in advanced head and neck reconstruction: from simple to its chimeric patterns and clinical experience with 22 cases. Plast Reconstr Surg. 2022;149(3):721–730. doi:10.1097/PRS.0000000000008878
15. Yamamoto T, Saito T, Ishiura R, Iida T. Quadruple-component superficial circumflex iliac artery perforator (SCIP) flap: a chimeric SCIP flap for complex ankle reconstruction of an exposed artificial joint after total ankle arthroplasty. J Plast Reconstr Aesthet Surg. 2016;69(9):1260–1265. doi:10.1016/j.bjps.2016.06.010
16. Abdelfattah U, Elbanoby T, Hamza F, et al. Treatment of advanced male genital lymphedema with a complete functional lymphatic system pedicled transfer. Urology. 2023;175:190–195. doi:10.1016/j.urology.2023.02.006
17. Meroni M, Scaglioni MF. Perforator-to-perforator SCIP-based vascularized lymphnode and lymphatic vessels transfer: a first report. Microsurgery. 2024;44(4):e31167. doi:10.1002/micr.31167
18. Caretto AA, Stefanizzi G, Fragomeni SM, et al. Lymphatic function of the lower limb after groin dissection for vulvar cancer and reconstruction with lymphatic SCIP flap. Cancers. 2022;14(4):1076. doi:10.3390/cancers14041076
19. Boissière F, Luca-Pozner V, Vaysse C, et al. The SCIP propeller flap: versatility for reconstruction of locoregional defect. J Plast Reconstr Aesthet Surg. 2019;72(7):1121–1128. doi:10.1016/j.bjps.2019.03.016
20. Yamamoto T, Fuse Y, Miyazaki T, et al. Transverse branch-based superficial circumflex iliac artery perforator (SCIP) flap: expanding indication of SCIP flap with a longer pedicle and/or multiple skin paddles. Plast Reconstr Surg. 2025. doi:10.1097/PRS.0000000000012640
21. Gentileschi S, Caretto AA, Servillo M, et al. Feasibility, indications and complications of SCIP flap for reconstruction after extirpative surgery for vulvar cancer. J Plast Reconstr Aesthet Surg. 2022;75(3):1150–1157. doi:10.1016/j.bjps.2021.11.005
22. Zubler C, Lese I, Pastor T, et al. The osteocutaneous SCIP flap: a detailed description of the surgical technique and retrospective cohort study of consecutive cases in a tertiary European centre. J Plast Reconstr Aesthet Surg. 2023;77:21–30. doi:10.1016/j.bjps.2022.10.056
23. Guiotto M, Bramhall RJ, Campisi C, Raffoul W, di Summa PG. A systematic review of outcomes after genital lymphedema surgery: microsurgical reconstruction versus excisional procedures. Ann Plast Surg. 2019;83(6):e85–e91. doi:10.1097/SAP.0000000000001875