A DIEP flap is a type of breast reconstruction that uses your own skin and fat from the lower abdomen to rebuild a breast after mastectomy. The name stands for deep inferior epigastric artery perforator, referring to the blood vessels that supply the tissue being transferred. Unlike older reconstruction methods, this technique leaves the abdominal muscles intact, which is its primary advantage.
How the Surgery Works
During a DIEP flap procedure, the surgeon removes a section of skin and fat from the lower abdomen, along with the tiny blood vessels (perforators) that feed that tissue. These perforators branch off a larger artery that runs beneath the abdominal muscle. The key distinction of this surgery is that the surgeon carefully threads the blood vessels out from the muscle without cutting through or removing muscle tissue itself.
The tissue is then completely detached from the abdomen and transferred to the chest, where the surgeon reconnects its blood vessels to vessels in the chest wall, typically in the space between the ribs. This reconnection happens under a microscope, with vessels as small as 1.0 to 1.5 millimeters in diameter being stitched together by hand. Once blood flow is restored, the tissue is shaped into a breast mound. Because the tissue is living and receives its own blood supply, the reconstructed breast feels soft and warm, and changes naturally with weight fluctuations over time.
Operating Time and Hospital Stay
This is a long surgery. For a single breast, the procedure averages about 7 hours of operating time. Bilateral reconstruction (both breasts) averages roughly 8.5 hours, though cases can range anywhere from about 5 to 11 hours depending on complexity.
Most patients spend 2 to 3 days in the hospital after surgery. Enhanced recovery protocols have shortened this significantly compared to earlier years, and many patients require little or no narcotic pain medication during their stay.
Recovery Timeline
The first two weeks are the most restrictive. You’ll wear surgical garments and need help with daily activities. By the end of week two, most patients can transition from surgical compression garments to a regular bra and abdominal girdle.
Weeks three and four bring noticeably more independence. If you have a desk job or other low-impact work, this is typically when you can return. By weeks five and six, most patients are back to their normal routine, and by the six-week mark there are generally no remaining physical restrictions.
How DIEP Differs From TRAM Flap
The DIEP flap was developed in 1994 specifically to address the downsides of the older TRAM flap technique. Both procedures use abdominal tissue for breast reconstruction, but they differ in one important way: the TRAM flap removes part or all of the rectus abdominis (the “six-pack” muscle) along with the tissue, while the DIEP flap leaves the muscle in place.
Sacrificing that muscle in a TRAM procedure raised concerns about hernias and lasting abdominal weakness. The DIEP flap was designed to avoid this by dissecting the blood vessels out of the muscle rather than taking the muscle with them. In practice, there can still be minor effects on the muscle during a DIEP flap, since the surgeon works through the muscle to isolate the blood vessels, and occasionally a small portion of muscle tissue comes along with the flap. Studies comparing abdominal strength after both procedures, however, have not found significant functional deficits in DIEP flap patients, even when a small amount of muscle was harvested.
Success and Complication Rates
DIEP flap reconstruction has a high success rate. A large German registry study covering thousands of cases found an overall flap survival rate of 96.9%. Total flap loss, meaning the transferred tissue fails completely, occurred in only 2.0% of cases. Partial flap loss happened in 1.1%.
The most common reason for a return to the operating room was blood vessel problems requiring emergency revision, which occurred in 4.3% of cases. Beyond vascular issues, about 8.3% of patients needed additional surgery for wound complications. The most frequent of these was blood collection at the chest site (3.2%), followed by wound-healing problems at the abdominal donor site (1.7%) or the chest (1.5%). Infection rates were low at both sites, under 1%.
Who Is a Good Candidate
The primary requirement is having enough abdominal tissue to reconstruct a breast. Women who are very thin or who have had extensive previous abdominal surgery (like a full tummy tuck) may not have sufficient donor tissue or intact blood vessels to support the flap.
Higher BMI does increase complication risks. Patients with obesity are more likely to experience wound-healing problems and other complications compared to those with a normal BMI. Morbid obesity (BMI of 40 to 49) has been associated with higher rates of total flap loss and delayed healing. That said, even patients classified as super obese (BMI of 50 or higher) have undergone successful DIEP flap reconstructions. A higher BMI is a risk factor, not an automatic disqualification.
Smoking is another significant concern, as it constricts blood vessels and directly threatens the survival of transplanted tissue. Most surgeons require patients to quit smoking well before surgery.
Restoring Sensation
One limitation of any breast reconstruction is the loss of sensation. The transferred tissue arrives at the chest without nerve connections, so the reconstructed breast initially has no feeling. However, a newer technique called nerve coaptation can improve this. During the reconstruction, the surgeon connects a sensory nerve from the abdominal tissue to a nerve in the chest wall, giving the transferred tissue a pathway to regain feeling.
Research consistently shows that flaps reconstructed with this nerve connection regain sensation earlier and to a greater degree than those without it. The technique does not add significant operating time or risk. Not all surgeons perform nerve coaptation routinely, so it’s worth asking about if preserving breast sensation is important to you.
Insurance Coverage
In the United States, the Women’s Health and Cancer Rights Act (WHCRA) requires most health plans that cover mastectomy to also cover all stages of breast reconstruction. This includes autologous procedures like the DIEP flap. The law covers not just the initial reconstruction but also subsequent revisions, surgery on the opposite breast for symmetry, and treatment of complications. If your insurer denies coverage for a DIEP flap specifically while approving other reconstruction methods, you have grounds to file a grievance.