Residency · Residency · Plastic Surgery

Autologous Breast Reconstruction: Alternative Flaps

Introduction

The DIEP flap is the first-line autologous option, but not all patients are candidates. Alternative flaps are indicated when the abdomen is unavailable (prior abdominoplasty, insufficient tissue, prior TRAM/DIEP) or when patient anatomy favors a different donor site. Selection depends on body habitus, prior surgical history, donor site morbidity tolerance, and volume requirements. Each alternative flap has distinct advantages and limitations.

TRAM Flap (Transverse Rectus Abdominis Myocutaneous)

Pedicled TRAM

Based on the superior epigastric artery (reverse-flow through the rectus abdominis). Muscle and overlying skin/fat tunneled to the chest. Historically the first widely used autologous breast reconstruction flap. Advantages: no microsurgery required, reliable.

Disadvantages: significant abdominal wall morbidity (full rectus harvest), fat necrosis rates higher than free flaps due to reverse-flow perfusion, limited reach for medial/inferior breast shaping. Largely replaced by free TRAM and DIEP in most centers.

Free TRAM

Based on the DIEA/DIEV (antegrade flow — superior perfusion compared to pedicled TRAM). Harvests a portion of the rectus muscle with the perforators. Muscle-sparing classifications (Nahabedian): MS-0: entire rectus muscle taken (traditional free TRAM).

MS-1: lateral segment of muscle preserved. MS-2: small cuff of muscle around perforator only (essentially a DIEP with a small muscle cuff). Better perfusion than pedicled TRAM; lower fat necrosis rates. More abdominal wall morbidity than DIEP but less than pedicled TRAM.

Latissimus Dorsi (LD) Flap

Anatomy

Based on the thoracodorsal artery and vein (from subscapular system). Type V muscle flap: one dominant pedicle (thoracodorsal) and secondary segmental pedicles. Large, flat muscle with reliable vascular anatomy. Skin paddle oriented transversely, obliquely, or vertically on the back.

Technique

Patient in lateral decubitus or modified position. Harvest through a posterior incision; skin island designed on the back. Muscle ± skin paddle tunneled to the chest through the axilla. Pedicled flap (most common) or free flap. Often combined with an implant for adequate volume (LD + implant).

Indications

Partial breast reconstruction (oncoplastic defects). Salvage after failed implant reconstruction. Irradiated chest wall (LD provides well-vascularized non-irradiated tissue). Small to moderate breast reconstruction (LD alone rarely provides sufficient volume for large breasts). Polish syndrome (chest wall and breast reconstruction).

Advantages

Extremely reliable pedicled flap (near 100% success rate). Does not require microsurgery. Provides vascularized muscle coverage for irradiated tissue or exposed hardware.

Disadvantages

Usually requires an implant for adequate projection and volume. Donor site scar on the back (visible in certain clothing). Seroma at donor site (most common complication, 10-80%). Shoulder weakness (usually compensated; rarely functionally significant). Donor site contour deformity.

<image>Surgical illustration of latissimus dorsi myocutaneous flap harvest and transfer for breast reconstruction. The left panel shows the patient in lateral decubitus position with the latissimus dorsi muscle outlined on the back, the thoracodorsal pedicle identified entering the muscle at its deep superior surface, and a transverse skin paddle designed on the muscle. The right panel shows the flap tunneled through the axilla to the anterior chest wall, with the muscle providing coverage over an underlying implant to reconstruct the breast mound. Labels identify the thoracodorsal artery and vein, the latissimus dorsi muscle, the skin paddle, the axillary tunnel, and the implant beneath the muscle on the chest wall. The donor site closure is shown with layered suture and a drain.</image>

SGAP (Superior Gluteal Artery Perforator) Flap

Anatomy

Based on perforators from the superior gluteal artery. Skin and fat harvested from the upper buttock. Pedicle emerges through the piriformis or above it; relatively short pedicle (6-8 cm).

Technique

Patient positioned prone or lateral decubitus for harvest, then repositioned supine for inset. Perforators identified by preoperative CTA. Intramuscular dissection through the gluteus maximus to the superior gluteal vessels. Free tissue transfer with microsurgical anastomosis to internal mammary or thoracodorsal vessels.

Advantages

Ample tissue in patients with generous buttocks. Avoids abdominal donor site. Scar concealed in clothing/swimwear.

Disadvantages

Short pedicle (technically challenging anastomosis). Intraoperative repositioning required. Buttock contour asymmetry. Sciatic nerve proximity (risk during dissection). Longer operative time. Sitting discomfort in early recovery.

IGAP (Inferior Gluteal Artery Perforator) Flap

Anatomy

Based on perforators from the inferior gluteal artery. Tissue harvested from the gluteal crease/inferior buttock.

Advantages

Scar hidden in the infragluteal fold. Adequate tissue volume.

Disadvantages

Sciatic nerve at greater risk than SGAP. Posterior femoral cutaneous nerve may be injured (posterior thigh numbness). Short pedicle. Buttock contour asymmetry (inferior buttock ptosis). Repositioning required.

TUG (Transverse Upper Gracilis) Flap

Anatomy

Based on the medial circumflex femoral artery (ascending branch), entering the proximal gracilis muscle. Skin paddle from the upper inner thigh in a transverse orientation.

Technique

Patient supine with legs abducted (frog-leg position). Gracilis muscle and overlying skin/fat harvested. Free flap transfer to the chest.

Advantages

Scar hidden in the upper inner thigh crease. Simultaneous harvest with mastectomy (two-team approach possible). Minimal functional deficit (gracilis is expendable). Good option for small to moderate-sized breasts.

Disadvantages

Limited volume (typically 200-400 cc; may be insufficient for large breast reconstruction). Medial thigh contour irregularity. Wound healing issues at donor site (high-tension closure in the groin crease). Lymphedema risk (proximity to inguinal lymphatics).

PAP (Profunda Artery Perforator) Flap

Anatomy

Based on perforators from the profunda femoris artery (specifically, the first or second perforating branch). Skin and fat harvested from the posterior medial thigh. Perforators emerge between the adductor magnus and the posterior thigh muscles.

Technique

Patient positioned prone or lateral decubitus. Perforators identified on preoperative CTA. Septocutaneous or musculocutaneous perforator dissection. Free flap transfer.

Advantages

Growing in popularity as a second-line option after DIEP. Donor scar in the posterior thigh crease (well-concealed). No muscle sacrifice. Adequate volume for small to moderate breasts. Can be combined with other flaps for bilateral reconstruction. Lower wound complication rates compared to TUG.

Disadvantages

Limited volume (similar to TUG). Requires prone positioning for harvest (repositioning if bilateral or simultaneous mastectomy). Variable perforator anatomy. Learning curve.

Stacked Flaps and Combined Approaches

For large-volume reconstruction when a single flap provides insufficient tissue. Stacked DIEP: bipedicled DIEP with both Zones I from each hemiabdomen stacked for unilateral reconstruction. DIEP + PAP or DIEP + TUG: combining donor sites for bilateral reconstruction (one flap per breast from different sites). Stacked PAP: bilateral PAP flaps for a single breast reconstruction. Increases operative time and complexity but addresses volume limitations.

Flap Selection Algorithm

First choice: DIEP (if abdominal tissue available and adequate). Abdomen unavailable: PAP > TUG > SGAP/IGAP > LD (with or without implant). Small breast, slim patient: PAP, TUG, or LD + implant. Large breast: DIEP preferred; consider stacked flaps if needed.

Irradiated field, implant failure: LD + implant or DIEP/PAP (free flap through non-irradiated vessels). Bilateral reconstruction: DIEP bilateral, or DIEP + contralateral PAP.

<image>Comparison illustration showing four alternative donor sites for autologous breast reconstruction, each with the patient body outline, flap skin paddle marked in color, and the vascular pedicle labeled. Panel A: Latissimus dorsi flap with the transverse skin paddle on the back and the thoracodorsal pedicle. Panel B: SGAP flap with the oblique skin paddle on the upper buttock and the superior gluteal artery pedicle. Panel C: TUG flap with the transverse skin paddle on the upper inner thigh and the medial circumflex femoral artery pedicle. Panel D: PAP flap with the transverse skin paddle on the posterior medial thigh and the profunda artery perforator pedicle. Each panel includes a small inset showing the typical volume range of the flap and its relative indication.</image>

Clinical Pearls

The PAP flap has emerged as the leading second-line option after DIEP, offering a well-concealed scar and no muscle sacrifice; it is particularly suited for thin patients with posterior thigh tissue. The latissimus dorsi flap remains the most reliable salvage option when implant reconstruction fails; its robust blood supply makes it ideal for irradiated fields. When performing gluteal flaps (SGAP/IGAP), the short pedicle is the primary technical challenge; consider using the thoracodorsal vessels as recipients (longer pedicle available after dissection) rather than internal mammary vessels.

For TUG flaps, harvest only the proximal portion of the gracilis muscle; excessive distal dissection increases wound complications without adding useful tissue volume. Always discuss donor site morbidity honestly with patients; the "best" flap is the one whose donor site trade-off is most acceptable to the individual patient. Stacked flap techniques are valuable but double the microsurgical risk; they should be performed only at high-volume microsurgery centers.

References

• Nahabedian MY, Momen B, Galdino G, Manson PN. Breast reconstruction with the free TRAM or DIEP flap: patient selection, choice of flap, and outcome. Plast Reconstr Surg. 2002;110(2):466-475.
• Allen RJ, Haddock NT, Ahn CY, Sadeghi A. Breast reconstruction with the profunda artery perforator flap. Plast Reconstr Surg. 2012;129(1):16e-23e.
• Saint-Cyr M, Wong C, Oni G, et al. The extended transverse upper gracilis (TUG) flap: vascular anatomy and clinical application. Plast Reconstr Surg. 2012;129(6):1293-1302.
• Guerra AB, Metzinger SE, Bidros RS, et al. Breast reconstruction with gluteal artery perforator (GAP) flaps: a critical analysis of 142 cases. Ann Plast Surg. 2004;52(2):118-125.
• Angrigiani C, Grilli D, Siebert J. Latissimus dorsi musculocutaneous flap without muscle. Plast Reconstr Surg. 1995;96(7):1608-1614.

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