A DIEP flap is a type of breast reconstruction that uses skin and fat from your lower abdomen to build a new breast after mastectomy. The name stands for deep inferior epigastric perforator, referring to the blood vessels that feed the transplanted tissue. Unlike older methods, the surgery takes the tissue without cutting through your abdominal muscle, which means less damage to your core strength and a faster recovery at the donor site. The result is a reconstructed breast made entirely of your own living tissue, with a look and feel similar to a natural breast.
How the Surgery Works
During a DIEP flap procedure, a plastic surgeon removes a section of skin and fat from the lower belly, along with tiny blood vessels called perforators that thread through the abdominal muscle without requiring the muscle itself to be taken. These perforators are carefully separated from the surrounding muscle under a microscope. The tissue is then moved to the chest, where the surgeon reconnects the blood vessels to vessels near the breastbone or under the arm using microsurgical techniques. Once blood flow is confirmed, the tissue is shaped into a breast mound.
The operation is long. A single-side (unilateral) DIEP flap typically takes 6 to 8 hours. If both breasts are being reconstructed, the surgery runs 10 to 12 hours. This length reflects the precision required: the surgeon must identify the best perforator vessels using preoperative imaging, dissect them free without damaging the muscle, and then perform the delicate work of stitching together vessels that may be only a few millimeters wide.
DIEP vs. TRAM Flap
The DIEP flap evolved from an older procedure called the TRAM flap, which also uses lower abdominal tissue but takes a portion of the rectus abdominis muscle (the “six-pack” muscle) along with it. Abdominal flaps are classified on a spectrum from MS-0, which takes the full width of the muscle, through MS-1 and MS-2, which spare increasing amounts, to MS-3, which is the DIEP flap, sparing the muscle entirely.
In practical terms, this muscle preservation matters most when both sides are reconstructed. Research comparing muscle-sparing TRAM flaps to DIEP flaps found that for unilateral reconstruction, patients reported similar abdominal function afterward. But in bilateral cases, the difference became stark: 84.6% of TRAM patients reported abdominal bloating compared to just 16.7% of DIEP patients. Studies measuring abdominal strength directly have found that at moderate effort levels, the two approaches perform similarly, but at the highest exertion levels, DIEP patients have a small but meaningful strength advantage.
DIEP flaps are also associated with lower rates of fat necrosis (small areas of hardened tissue within the reconstructed breast) and shorter hospital stays compared to TRAM flaps.
Success Rates and Risks
DIEP flap surgery has a high success rate. Total flap failure, where the transplanted tissue dies and must be removed, occurs in only 1 to 2% of cases. That said, the procedure carries other potential complications: wound-healing problems, blood clots in the connected vessels, blood pooling (hematoma), venous congestion where blood can’t drain properly, and partial tissue loss. Most of these are manageable and don’t require losing the entire reconstruction.
The risk profile shifts with certain health factors. Higher BMI increases the chance of complications. Research on patients with a BMI of 40 to 49 found higher rates of total flap loss, more major complications, and slower wound healing. However, even patients with a BMI above 50 have successfully undergone the procedure, so elevated weight alone does not automatically rule it out. Your surgical team will weigh your overall health, including factors like diabetes, blood pressure, and smoking history, to determine whether the procedure is a reasonable option for you.
The Donor Site: Your Abdomen After Surgery
The tissue is taken from the same area targeted in a tummy tuck, and the resulting scar sits low across the lower abdomen, typically hidden by underwear or a bikini bottom. Because the muscle is left intact, the abdominal wall retains most of its structural integrity. Some patients need a small repair (plication) of the muscle layer, and the belly button is repositioned to look natural in its new location. At six weeks, the scar is generally well healed with minimal distortion.
Many patients consider the flatter abdomen a secondary benefit of the procedure, though the primary goal is always providing enough tissue for a natural-looking breast reconstruction.
Sensation in the Reconstructed Breast
One of the biggest concerns people have is whether the new breast will have any feeling. Without special techniques, transplanted tissue loses its nerve connections, and sensation recovery is limited. A newer approach called sensory nerve coaptation addresses this by connecting a nerve within the abdominal tissue to a nerve on the chest wall during the microsurgery.
Results from a randomized controlled trial at 24 months showed meaningful differences. Patients who received nerve coaptation had significantly better touch sensitivity across the flap skin. They could detect lighter touch and were far more likely to sense heat pain, an important protective function. In the non-innervated group, 42% could not perceive heat pain at all, compared to only 10% in the innervated group. The shift from complete loss of protective sensation to diminished but present sensation is clinically significant, reducing the risk of accidental burns or injuries. Not all surgeons perform this step, so it’s worth asking about if sensation matters to you.
What Recovery Looks Like
Many surgical centers now use enhanced recovery protocols that reduce pain and speed up the process. Most patients need little to no narcotic pain medication and spend about 3 days in the hospital, though some stays extend to 4 or 5 days depending on the center and the complexity of the surgery.
During the first week, you’ll be walking multiple times the day after surgery, gradually increasing your distance. By day 3, most patients go home. In the second week, surgical drains (if used) come out once fluid output drops to an acceptable level, and you can begin gentle arm range-of-motion exercises. By weeks 3 to 4, daily tasks feel more manageable, and people with desk jobs can often return to work. By weeks 5 to 6, most patients are back to their normal routine, though strenuous exercise and heavy lifting take longer to resume.
The reconstructed breast continues to settle and soften over several months. Some patients choose a follow-up procedure later for fine-tuning, such as adjusting symmetry or reconstructing a nipple.
Who Is a Good Candidate
The ideal candidate has enough abdominal tissue to create the desired breast size, is in reasonable overall health, and does not smoke (or is willing to quit well before surgery). Smoking impairs blood flow to the transplanted tissue and significantly raises complication rates. Previous abdominal surgeries, particularly those that may have disrupted the deep inferior epigastric blood vessels, can affect eligibility, though they don’t always rule it out.
Patients with higher BMIs face increased risks but are not automatically excluded. The decision depends on the full picture: cardiovascular health, diabetes management, and the surgeon’s experience with complex cases all factor in. A preoperative CT scan maps the abdominal blood vessels, helping the surgical team plan the best approach or determine if an alternative reconstruction method would be safer.