Desmoid tumors are infrequent but may develop in young women after delivery. Its tendency to recur obliges to make a wide resection with enough margins. The abdominal wall reconstruction (AWR) is challenging. We present a descriptive case of AWR with posterior component separation in a desmoid tumor located in the right iliac fosa. In this video, we show the case of a young woman, 26 years, that devoloped a desmoid tumor on RLQ. A CT scan revealed a mass of 6 x 8 in the lateral abdominal wall muscle layers. The resection comprised the identification and incision on all the muscles involved, from the lateral part of rectus muscle to the oblique and transversus abdominis to the level of anterior superior iliac spine. We cut, cranially, the lateral border of the rectus sheath (PRS) to avoid injury the neurovascular bundles that innervate the rectus muscle. A posterior component separation avoiding cutting the transversus abdominis in the cranial part, making it lateral to medial (reverse TAR). The reconstruction with mesh was made with an absorbable mesh that helped to make the Stoppa (inguinal area) and "taco" configurations (retroperitoneum) of a large piece of polypropylene mesh. The patient was discharged uneventfully on the 4th postoperative day without signs of recurrence, hernia or bulging after 1 year.The anatomical knowledge learned from the TAR helps to solve AWR after resection of lateral abdominal wall muscles.