Figure 19.

Schematic diagram of the macrovascular arteriovenous shunt (MAS) between a deep inferior epigastric artery (DIEA) perforator (DIEA-P) and the superficial inferior epigastric vein (SIEV). This shunt occurs within the deeper subcutaneous fat, unlike small-vessel microvascular arteriovenous anastomoses (M-AVAs), which occur more superficially at a precapillary level (Reproduced with permission from: Rozen WM, Chubb D, Ashton MW, et al. Macrovascular arteriovenous shunts (MAS): a newly identified structure in the abdominal wall with implications for thermoregulation and free tissue transfer. J Plast Reconstr Aesthet Surg 2010;63:1294-9).