LICAP Flap Surgery for Partial Breast Reconstruction

The LICAP flap, short for lateral intercostal artery perforator flap, is a surgical technique that borrows skin and fat from the side of the chest wall to rebuild breast shape after cancer surgery. It belongs to a family of procedures called chest wall perforator flaps, which share a defining advantage: they move tissue into the breast without cutting through any muscle. The technique has gained traction over the past decade as oncoplastic breast surgery has pushed toward preserving both oncologic safety and natural appearance, and its role is expanding beyond the lumpectomy defect it was originally designed for.

Where the Blood Supply Comes From

Every perforator flap depends on small blood vessels that thread up through deeper tissue to feed the overlying skin and fat. The LICAP flap gets its name from the specific vessels it relies on: branches of the lateral intercostal arteries that emerge between the ribs along the side of the chest. These perforators tend to be the larger, more dominant vessels in the fourth through seventh intercostal spaces, making them reliable anchors for a flap of meaningful size.¹ The anatomy is not always straightforward, though. MRI-based mapping has shown that the lateral chest wall’s blood supply involves an intricate network where intercostal vessels communicate with branches of the lateral thoracic artery, rather than each perforator running in clean isolation.² That interconnected network actually works in the flap’s favor: even if one vessel is small or absent, neighboring connections help maintain blood flow.

Preoperative Planning With Ultrasound

Because the flap’s survival hinges on those perforating vessels, surgeons typically map them before the operation. Color Doppler ultrasound has become the standard planning tool, and recent data suggests it is remarkably accurate. In a study correlating preoperative skin markings with intraoperative findings, the dominant perforator identified by ultrasound was confirmed during surgery in every case examined. The average distance between where the ultrasound predicted the vessel would emerge and where it actually appeared was roughly two to three millimeters.³ That level of precision lets the surgeon design the flap’s shape and orientation before making a single incision. The lateral perforators themselves tend to be larger than their counterparts near the breastbone, measuring about 2 mm on ultrasound and close to 1.7 mm when seen directly in surgery.⁴

Some teams also use standard breast MRI scans to study the vascular anatomy in advance, particularly when planning more complex reconstructions or when the patient’s anatomy is atypical.⁵ The trend is clearly toward more imaging rather than less, because a well-mapped flap translates to shorter operating time and fewer surprises once dissection begins.

How the Surgery Works

The patient lies face up with both arms out to the side. If the procedure follows a lumpectomy, the surgeon first lifts the breast skin off the underlying tissue and rotates what remains of the breast to partially fill the cavity left by tumor removal. Attention then shifts to the lateral chest wall, where the flap is designed. The dissection starts at the far tip of the planned flap and works inward, moving above the muscle fascia but below the skin and fat. The surgeon identifies the lateral border of the latissimus dorsi muscle as a landmark and carefully preserves the perforating vessels, usually those in the fifth and sixth intercostal spaces, within a zone about six to eight centimeters from the front of the armpit.⁶

Once the flap is freed on all sides except its perforator pedicle, it is rotated or transposed into the breast pocket like a hinged door. The outer skin layer is removed (de-epithelialized) so the flap becomes a buried pad of fat and dermis, and the breast skin is re-draped over it. Tacking sutures anchor the flap to the chest wall.⁷ The whole procedure stays on the same side of the body: there is no distant donor site, no microsurgery, and no muscle sacrifice. That last point matters because it means the patient’s arm and shoulder function remain intact, avoiding the weakness that can follow techniques like the latissimus dorsi flap.

Primary Use in Breast-Conserving Surgery

The LICAP flap’s home turf is filling defects after lumpectomy, especially when the tumor sits in the outer half of the breast. Removing a tumor from the outer quadrant can leave a noticeable dent or pull the nipple off-center, and the LICAP flap’s position on the lateral chest wall makes it a natural fit to slide tissue into that gap. A case report in Cureus described it as producing exceptional aesthetic results, preserving a natural breast contour while achieving clear surgical margins.⁸ Chest wall perforator flaps more broadly, including the LICAP, allow surgeons to remove larger volumes of breast tissue without the cosmetic penalties that used to make mastectomy the default for bigger tumors.⁹

The practical result is that some patients who would otherwise need a full mastectomy can keep their breast. One study evaluating patient-reported outcomes after LICAP reconstruction found that the technique “reduces the mastectomy rate and increases the overall survival,” suggesting that enabling breast conservation may have benefits beyond cosmetics.¹⁰

Volume It Can Provide

The LICAP flap is not just a patch for small defects. A four-year series of 16 LICAP flaps in 11 patients found the average flap volume was about 200 cc, enough to add one to two cup sizes. In that series, indications went well beyond lumpectomy: the flap was used for bilateral augmentation after DIEP flap reconstruction, correction of asymmetry from partial flap loss, and contralateral augmentation for symmetry.¹¹ No flap failures or fat necrosis occurred in that group, with only minor complications like cellulitis and seroma at the donor site. That kind of versatility positions the LICAP as an alternative to implants or fat grafting for patients who need a moderate volume boost without a major abdominal or thigh donor site.

How It Compares to Similar Flaps

The LICAP is one of several perforator flaps available for partial breast reconstruction. Its closest relative is the TDAP (thoracodorsal artery perforator) flap, which draws from a slightly different vascular territory in the same general area. A head-to-head comparison found that complication rates and cosmetic outcomes were similar between the two, but the LICAP was technically easier to perform and had more consistent perforators, while the TDAP required more involved dissection and more careful preoperative Doppler mapping.¹² Both are considered reliable choices for defects in the outer breast.

A broader review pooling data from 432 patients across multiple lateral chest wall perforator flaps (including LICAP, LTAP, and LTD variants) reported satisfactory outcomes in 78 to 100 percent of cases, patient satisfaction ranging from about 76 to 93 percent, an overall complication rate of roughly 9 percent, and very low donor site problems at under 4 percent.¹³ The evidence does not clearly favor one lateral perforator flap type over another; the choice often comes down to where the defect sits and what the surgeon sees on preoperative imaging.

Complications and What to Expect

No surgery is complication-free, but the LICAP flap’s safety profile is reassuring relative to more complex reconstructive options. A review encompassing 829 patients who underwent various chest wall perforator flap procedures found complications in about 17.5 percent. The most common issue was fat necrosis or hardened fatty tissue (31 cases), followed by flap congestion (11 cases), hematoma (10 cases), and infection (7 cases). Outright flap failure was rare, occurring in only 2 of 418 patients tracked.¹⁴

Seroma at the donor site is probably the most frequent nuisance. A series of 10 patients who had their LICAP flaps harvested through a Wise-pattern incision (a technique that hides the scar within a breast reduction pattern) reported two postoperative seromas, both managed at follow-up appointments without further surgery.¹⁵ Seroma is essentially a pocket of fluid that the body produces in the space where tissue was removed; it usually resolves with drainage and does not affect the final result.

Patient Satisfaction and Quality of Life

The question patients care most about is whether they will feel like themselves afterward. Breast-Q, a validated questionnaire widely used in breast surgery research, captures several dimensions: how satisfied a patient is with the appearance of the breast, how they feel psychologically, and how the surgery affects physical comfort. A study that assessed Breast-Q scores at least a year after LICAP reconstruction and completion of radiation therapy found no significant differences between preoperative and postoperative scores across all modules.¹⁶ In other words, patients felt about the same about their breasts after cancer surgery and reconstruction as they did before, which is a genuinely strong result when you consider what they went through in between.

Another group reported median Breast-Q scores at about 17 months out of 87 out of 100 for psychosocial well-being, 82 out of 100 for breast satisfaction, and 71 out of 100 for physical well-being.¹⁷ Those numbers sit in the favorable range for breast reconstruction outcomes. Physical well-being scores tend to be the lowest dimension after any breast surgery, largely because of tightness and reduced sensation rather than functional limitation.

Radiation Tolerance

Most patients who undergo breast-conserving surgery for cancer will need radiation therapy afterward. Whether a reconstructive flap can tolerate radiation without breaking down is a practical concern. Data on LICAP and related perforator flaps is encouraging: in one series, radiation was administered in 72 percent of cases without compromising the flap.¹⁸ This makes sense biologically: perforator flaps bring in their own vascularized tissue, which tends to handle radiation better than tissue that has been undermined and repositioned without a dedicated blood supply. That said, the broader complication review did note that the three cases of capsular contracture in the entire dataset all occurred in patients who received postoperative radiation, so the interaction is not completely benign.¹⁹

The Learning Curve

Surgeons adopting the LICAP flap can expect a learning phase that is steep but short. Learning-curve analysis in one series showed a significant drop in operative time after about the sixth case.²⁰ Compared to microsurgical free flaps, which require specialized equipment and years of fellowship training, the LICAP is a pedicled local flap: the tissue stays connected to its blood supply and is simply rotated into position. There is no vessel anastomosis under a microscope. This makes it accessible to oncoplastic breast surgeons and not just dedicated microsurgeons, which matters for patients treated at community hospitals without a full reconstructive team.

The relative technical ease also means the surgery tends to be shorter and can sometimes be performed as an outpatient procedure or with a single overnight stay, which has implications for cost and recovery.²¹

The Donor Site Scar

One of the LICAP flap’s trade-offs is the scar it leaves along the lateral chest wall. A traditional LICAP harvest creates a long scar that may extend beyond the bra line, which bothers some patients. Surgeons have responded with modifications. An arc-shaped flap design has been proposed to reduce lateral scar visibility. More recently, a “scarless” approach harvests the LICAP flap through a Wise-pattern incision (the inverted-T incision used in breast reductions), eliminating any separate lateral scar entirely.²² These refinements reflect a broader principle in oncoplastic surgery: the initial technique proves the concept, and subsequent iterations whittle away the downsides.

The Reverse LICAP and Design Variations

The standard LICAP flap is designed with its base near the perforators and its tip extending laterally or posteriorly. A “reverse” version flips that orientation, basing the flap laterally and using the submammary perforator vessels to feed it. In a series of patients who underwent the reverse LICAP, all flaps survived. About 10 percent had minor ischemia at the distal tip that was trimmed during surgery, but at twelve months, all patients had stable results with good nipple position, breast shape, and projection.²³ Having both standard and reverse options gives surgeons more flexibility to reach defects in different parts of the breast.

Uses Beyond the Breast

Although breast reconstruction is where the LICAP flap has found its largest audience, the same vascular anatomy can be exploited for other reconstructive problems. Intercostal artery perforator propeller flaps have been used to cover defects after sarcoma removal from the trunk, including the back, lumbar area, chest, and abdomen. In a series of nine such flaps in seven patients, all but one survived completely, and the single complication was minor marginal necrosis in a flap harvested close to a previous donor site.²⁴

In a more unusual application, a LICAP-based reverse thoracic flap was used to reconstruct the inner elbow area. The authors noted several advantages for that particular use: the pedicle does not kink when reaching the antecubital fossa, the skin harvested from the mid-axillary line is hairless, and the resulting donor scar sits on the back where it is less visible.²⁵ These cases remain individually reported rather than studied in large series, but they illustrate how understanding a vessel’s anatomy opens doors beyond the initial application.