Examination of Sensory Recovery of Breasts Reconstructed With Silicone Breast Implants After Nipple-Sparing Mastectomy.

Background: Reconstructed breast with silicone breast implants (SBIs) after nipple-sparing mastectomy (NSM) provides high patient satisfaction from a cosmetic point of view, but low patient satisfaction with respect to hypoesthesia of the reconstructed breast, and reinnervation is required. Currently, few reports are available on reinnervation in breast reconstruction with implants, and detailed data on desensitization of reconstructed breasts are lacking. Therefore, we examined perceptual data after NSM with respect to reinnervation. Methods: In our department, after NSM, tissue expander or SBI was used to perform 1-stage or 2-stage breast reconstruction, and touch, warm and cold, and pain sensations in 31 cases more than 1 year after completion of reconstruction were examined. Results: All tests of sensations tended to be better in the medial region than in the lateral region, but no correlation with postoperative years was found. In the comparison of the incision lines, in the Semmes-Weinstein monofilament test (SW test), a significant difference was observed between the inframammary fold (IMF) incision and the para-areola incision in the breast D region, between the lateral incision and the para-areola incision, and between the IMF incision and the para-areola incision in the areola b region. In addition, linear regression analysis of postoperative years did not establish a predictive formula for the SW test or pain sensation in any of the 9 regions. Conclusions: The difference in the excision range was considered to be the largest factor affecting hypoesthesia. We also speculated that preservation of the internal mammary artery perforators during mastectomy led to preservation of the anterior cutaneous branch of the intercostal nerves, and therefore, the perception of the medial region was better than that of the lateral region. In the case of NSM in which the anterior cutaneous branch was preserved, the recovery of outer perception including that of the nipple-areolar complex (NAC) was poor, so it was considered that nerve reconstruction between the lateral cutaneous branch and the NAC was effective for reinnervation.