D146. What Nipple Reconstruction Can Tell Us About the Latissimus Dorsi Flap Subdermal Plexus

Abstract

PURPOSE: We previously presented our experience of local flap nipple reconstruction over various breast mound reconstructive modalities. Despite a conception that nipple reconstruction may be more reliable over flap beds than mastectomy skin, we preliminarily found that C-V flap designs on latissimus dorsi flap reconstructed breast mounds experience a 10-fold higher necrosis rate compared to implants or abdominally based flaps, leading the senior author to change his practice to exclusively base C-V flaps laterally over latissimus flaps. METHODS: A retrospective review was conducted from 2012 to 2022 of patients who underwent primary C-V subdermal pedicle flap nipple reconstruction by a single surgeon over implant-based, latissimus dorsi, and abdominally-based flap breast reconstruction. Demographics, C-V flap orientation, and nipple necrosis complications were recorded. RESULTS: Four hundred ninety-three nipple reconstructions in 312 patients were included, consisting of 41 latissimus dorsi, 45 deep inferior epigastric perforator, and 51 pedicled transverse rectus abdominis muscle flaps, 203 staged expander-to-implant, and 125 direct to implant reconstructions. In the latissimus cohort, 24.3% of patients experienced postoperative necrosis versus 1.6% to 5.9% among other reconstructive modalities. More interestingly, since the implementation of a laterally-based C-V flap on latissimus breast mounds, the complication rate fell to 10%. CONCLUSION: Our initial data, confirmed with the latest update, seem to highlight the unique subdermal plexus directionality in the latissimus dorsi flap compared to all other common reconstructed breast mounds. Extrapolated, these findings may imply a potential directional relationship between the subdermal vascular plexus and the axial pedicle of the underlying flap.