Sir: The lateral aspect of the thigh is an important donor site for flap harvest due to the high number of type B and C perforators suitable for pedicled and free tissue transfer. The tensor fasciae latae flap, originally described by Hill (in Plastic and Reconstructive Surgery in 1978), represents an important source of soft tissue for composite and functional reconstructions. We read with interest the article entitled “Tensor Fasciae Latae Perforator Flap: Minimizing Donor-Site Morbidity in the Treatment of Trochanteric Pressure Sores,”1 in which the authors recognized the ascending branch of the circumflex femoral artery as the unique source of vascularization of the tensor fasciae latae muscle in 100 percent of the dissected legs. We performed a review of the related literature using plastic surgical journals and PubMed as the main sources of information. Among these articles, we found an important discordance about the identification of the main source of this muscle. Koshima et al.2 described the transverse branch of the lateral circumflex femoral system as the primary vascular supply of the tensor fasciae latae muscle; Kimura,3 in agreement with Ishida et al.,1 recognized the ascending branch of the lateral circumflex femoral artery as the main source of the muscle. Rifaat and Abdel Gawad,4 in accordance with Koshima et al.,2 found the transverse branch of the circumflex femoral artery to be the main source of all of their flaps (n = 12). In an ongoing cadaveric dissection study, we have dissected 31 lower limbs injected with latex. We found the tensor fasciae latae muscle to be supplied in 74 percent from the ascending branch of the lateral circumflex femoral artery and in 13 percent of the sites from the transverse branch of the lateral circumflex femoral artery; in another 13 percent, the artery supplying the tensor fasciae latae was found to arise directly from the common femoral artery or from the deep femoral artery. In four thighs we noticed a secondary arterial supply nourishing the tensor fasciae latae muscle by arising from either the ascending or the descending branch or directly from the femoral artery (Fig. 1).Fig. 1.: Left side of the groin of an injected cadaver in which the source vessels to the tensor fasciae latae have been dissected. F.V., femoral vein; F.A., femoral artery; A.B., ascending branch of the lateral circumflex femoral artery; arrow, secondary source from the femoral artery.The variability about the origin and branching pattern of the lateral circumflex femoral artery has already been reported.5 The aim of this short report about the main source of the tensor fasciae latae flap (as a muscular, musculocutaneous, or perforator flap) is to invite surgeons to exercise caution during the deep dissection of the pedicle, as its vascular supply presents a higher variability than previously reported. Stefano Cotrufo, M.D. Joerg Dabernig, M.D. Canniesburn Plastic Surgery Unit Glasgow Royal Infirmary Glasgow, United Kingdom Integrated Biological and Life Sciences Section for Human Anatomy University of Glasgow Glasgow, United Kingdom Department of Surgical and Perioperative Science Section for Hand and Plastic Surgery University Hospital Umea, Sweden Department of Integrative Medical Biology Section for Anatomy Umea University Umea, Sweden ACKNOWLEDGMENT This research was sustained by the Steven Forrest Charitable Trust.