Fig. 7.1
Buttonhole preoperative marking showing the curved horizontal line defining the lower border of the upper flap. The upper flap is buttonholed to receive the nipple-areola that is carried on an inferiorly based dermal-fat flap. The nipple-areola is moved up 12 cm for placement at 24 cm from the suprasternal notch (blue circles)
For 7–9 cm lifts, the markings are the same, except that the inframammary marking is “notched” centrally in an inverted-V fashion to increase the height of the inferior pole by 1–2 cm. If this modification does not provide the desired 5–7 cm height for the inferior pole then the excess skin in the central inframammary fold may be rearranged during the closure, moving it from the horizontal plane to the vertical plane to gain a few cm at the meridian of the breast.
The mastopexy-nipple-sparing mastectomy is an oncologic-plastic team effort, with the plastic surgeon initially assisting the oncologic surgeon on the mastectomy, followed by both surgeons operating simultaneously to perform the sentinel lymph node biopsy or axillary lymphadenectomy, contralateral mastectomy, buttonhole mastopexy, and expander insertion. Prior to raising the mastectomy flaps, the areola is circumscribed keeping its diameter at 4–4.5 cm, and the transverse incision is made as marked preoperatively to raise the upper flap superficial to the anterior mammary fascia. The inferior flap dissection starts medially and laterally because of a well-defined anterior mammary fascial plane, and then proceeds towards the areola. On reaching the areola the dissection is carried through the breast, leaving a 5 mm thick layer of breast tissue attached to the areola. At this point a generous biopsy is obtained from the base of the areola for permanent sections and the periphery of the subareolar tissue tagged with 6–8 medium-size hemoclips for future guidance in the complete removal of the breast tissue at the time of expander implant exchange. As the dissection moves inferiorly towards the inframammary fold, care is taken not to dissect beyond the inframammary fold to avoid damaging the intercostal blood supply to the inferiorly based dermal-fat flap.
After completion of the mastectomy, the entire inferior flap is deepithelialized to create a broad-based 15–20 cm dermal-fat flap carrying the preserved nipple-areola (Fig. 7.2a). The expander (Mentor CPX3, Irvine, CA) is then fixed in place over the pectoralis major muscle using absorbable sutures (Fig. 7.2b) and the upper flap retracted down to cover the dermal-fat flap (Fig. 7.2c) and suture it to the inframammary margin of the deepithelialized flap. Because the upper flap is longer than the inframammary incision, suturing proceeds from both ends, easing the skin towards the meridian of the breast; the scalloping of the skin centrally flattens out postoperatively. Finally, the skin and subcutaneous fat in the predetermined nipple-areola location is cored out (4.5 cm diameter) to exteriorize the nipple-areola and suture it in place (Fig. 7.2d). The wounds are routinely drained with a single fluted drain .
Fig. 7.2
Combined mastopexy-nipple-sparing mastectomy technique. The broad-based inferiorly based dermal-fat flap carries the nipple-areola to its new location (a). Tissue expander fixed in place over the pectoralis major muscle. The inferior flap that has been flipped over shows the preserved full-thickness subcutaneous fat (b). The superior flap retracted inferiorly to cover the expander. A circular area of full-thickness skin flap (blue circle) will be excised to receive the nipple-areola (c). Nipple-areola pulled through the buttonhole for suturing in place (d)
For 7–9 cm nipple displacements in which the distance between the lower border of the upper flap and the proposed lower border of the areola is less than 5 cm, the buttonhole mastopexy has to be modified to increase the vertical length of the lower pole of the breast. As mentioned earlier, “notching” the inframammary incision at the meridian of the breast will increase the height of the lower pole by 1–2 cm. Another maneuver that increases the inframammary-to-areola distance is shifting the excess skin of the upper flap from the horizontal plane into the vertical plane during the skin closure at the meridian of the breast. This skin shift creates a dog-ear deformity in the vertical plane that is corrected by deepithelializing the excess skin, infolding it, and repairing the skin margins for a final inverted-T suture line. Minor dog-ear deformities that are not corrected primarily may be repaired during the second-stage implant exchange .
Second-Stage Expander Implant Exchange and Removal of Retained Subareolar Breast Tissue
The timing of the second-stage procedure depends on whether the patient is to undergo postoperative radiation therapy or chemotherapy. If radiation therapy is planned, 6 months are allowed before exchanging the implants. Patients having completed chemotherapy wait a month to have the implants exchanged. In the second-stage implant exchange both oncologic and plastic surgeons participate in the first part of the procedure to remove the residual subareolar breast tissue. An 8 cm lateral inframammary incision is made dividing the outer half of the previously deepithelialized inferiorly based pedicle flap to expose the expander and remove it. The nipple-areola is then everted for the oncologic surgeon to excise the retained breast tissue. A 25-G needle passed through the periareolar skin as well as the previously applied hemoclips serve as guides to the peripheral borders of the circular subdermal breast tissue resection. The subareolar specimen is properly oriented and submitted for permanent pathologic examination.
The second part of the procedure involves the capsulotomy, and insertion of the permanent silicone implant. First, radial capsulotomies are performed around the periphery of the areola to smoothen out the transition between the capsule and the undersurface of the areola. A prepectoral peripheral capsulotomy is then made from 7 o’clock to 5 o’clock, undermining the flap subcutaneously for several centimeters. To maintain the integrity of the inframammary fold the inferior border of the capsule is left intact. Additional radial incisions/cross hatching along the periphery of the capsule may be needed to correct any external skin irregularities.
During the second-stage reconstruction the shape of the breast may be improved. If the breast has a square shape because of the broad-based dermal-fat flap, the lateral portion of the flap is trimmed and the excess infra-axillary subcutaneous fat debulked to give the reconstructed breast a more rounded appearance. The medial debulking, if needed, will require a separate medial inframammary incision along the previous scar. Following the contouring of the breast the permanent silicone implant is inserted and the wound closed over a single fluted drain.
Safety of Primary Buttonhole Mastopexy
The primary buttonhole mastopexy as part of the nipple-sparing mastectomy is a safe procedure both from a technical and oncologic standpoint. The Passot buttonhole technique [10] that was originally described for reduction mammoplasty has been adapted for primary mastopexy in patients with large ptotic breasts who are to undergo a nipple-sparing mastectomy. In the modification of the Passot technique, a 15–20 cm wide, inferiorly based, random pattern dermal-fat flap is used to carry the nipple-areola and raise it 7–12 cm, placing it around 20–24 cm from the suprasternal notch. Lifts greater than 12 cm are feasible provided the width-to-height ratio of the inferior pedicle flap does not exceed 1:1 ratio.
In addition to proper flap design, the success of the buttonhole mastopexy depends on the use of a “thick” inferior pedicle dermal-fat flap that retains the full-thickness subcutaneous fat to sustain the blood supply to the apex of the flap. Because the apex of the flap harboring the nipple-areola is the most tenuous portion of the flap, the subareolar breast tissue cannot be thinned down to the dermis. Removing the subareolar breast tissue will invariably result in partial or full-thickness nipple-areola loss. It is imperative therefore to temporarily leave a thin layer of subareolar breast tissue in place during the first stage and remove it in the second stage when the implant is exchanged. Resecting the entire subareolar breast tissue during the second stage does not jeopardize the nipple-areola because of collateral circulation through the surrounding skin. By the same token, dividing the lateral half of the base of the flap to remove the expander and access the undersurface of the areola does not affect the viability of the remaining flap because of the delay phenomenon that enhances the circulation to the dermal-fat flap.