Absent Internal Mammary Recipient Vein in Autologous Breast Reconstruction.

The internal mammary vessels (IMA/Vs) have been used as the first-choice recipient vessels for microsurgical anastomosis and flap inset in autologous breast reconstruction owing to their ease of access and use compared with the thoracodorsal vessels (TDA/Vs). Herein, we report two cases of deep inferior epigastric perforator flap breast reconstructions in which the recipient internal mammary vein (IMV) was lacking. In the first case, a 50-year-old patient underwent delayed two-stage reconstruction, and in the second, a 45-year-old patient underwent delayed reconstruction because of capsular contracture following breast implant reconstruction. Neither patient received preoperative radiation therapy. During IMA/V preparation, we could not find the internal mammary vein (IMV) around the internal mammary artery (IMA) despite careful dissection. No internal mammary lymph node adenopathy and vascular encasement from metastasis were noted. Intraoperative indocyanine green angiography revealed absence of IMV, which was presumed to be congenital. Therefore, microsurgical anastomosis was performed to connect the deep inferior epigastric vessels to the thoracodorsal vessel. The postoperative course was uneventful in both cases. Although many anatomical studies have revealed different locations, diameters, branching patterns, and perforators of the IMA/V, absent IMV has been reported very rarely. In autologous breast reconstruction, plastic surgeons should be prepared for the possibility of the absence of IMV.