Sir: Modern reconstructive surgery has increased the importance of perforator flaps. However, there are many variations in the position of perforators, and it is difficult to perform effective surgical planning. Thermography, Doppler ultrasound, and supersonic color Doppler imaging have been used for preoperative detection of perforators; these methods have both merits and disadvantages but ultimately do not always provide definitive results. In contrast, enhanced multidetector computed tomography allows accurate detection of perforators before surgery case by case, and is a very useful tool in preoperative planning for surgery using perforator flaps. The three-dimensional image supplies the exact location of perforators (Fig. 1), and we compose a three-dimensional image using computed tomographic data (Fig. 2).Fig. 1.: Computed tomographic image of the abdominal wall. P1, right-side main perforator; P2, left-side main perforator.Fig. 2.: Sagittal section. View from the umbilicus. P1, right-side main perforator; U, umbilicus; SEV, superficial epigastric vein.The deep inferior epigastric perforator (DIEP) flap was developed by Koshima et al. in 19891–3 and is particularly useful because it retains the function of the rectus abdominis muscle and uses surplus adipose tissue. For this reason, it has been used for reconstructive mammaplasty by Allen and Blondeel; subsequently, anterolateral thigh, gluteal artery perforator, thoracodorsal artery perforator, and tensor fasciae latae flaps have been developed for use over much of the body.4 However, it is often difficult to predict the positions of perforators before surgery because of the variation in these positions. In this communication, we show that multidetector computed tomography can be used to plan an operation in detail; in this sense, multidetector computed tomography can perhaps be understood to illuminate reconstructive surgery in a manner analogous to Edison’s development of the light bulb in 1879. Many anatomical reconstructions are performed using perforator flaps as standard medical practice. In 1987, Taylor and Minabe5 reported a detailed examination of the angiosome in the context of nourishment perforators of the abdominal wall based on obduction data. Determination of accurate positions for perforators is difficult; for example, in blood vessel anatomy performed in cadavers, correspondence of individual build differences and vascular variation cannot be achieved based on the mean anatomical position of each blood vessel relative to the previous vessel. The number of perforators depends on sex and the thickness of the abdominal wall: the physical features of women require more perforators, and patients with a thick abdominal wall panniculus adiposus also tend to have more perforators. One further characteristic of the examination is that the microvasculature is not easily recognized in a thin panniculus adiposus. DIEP flaps are used for reconstructive mammaplasty in patients with breast cancer, and presurgical planning with knowledge of the position of perforators is useful in this procedure. Both preoperative and postoperative multidetector computed tomography is particularly appropriate in breast cancer patients, who also require this procedure for diagnostic purposes, and simultaneous scanning from the thoracic region to the abdominal region is possible. Multidetector computed tomography is particularly useful in breast cancer patients because it is also used for preoperative and follow-up cancer diagnostic testing and therefore serves two simultaneous purposes in these patients. Makoto Mihara, M.D. Misa Nakanishi, M.D. Miho Nakashima, M.D. Mitunaga Narushima, M.D. Isao Koshima, Ph.D. Department of Plastic and Reconstructive Surgery Tokyo University Tokyo, Japan DISCLOSURE The authors have no financial or other commercial interest in the work described in the communication.