Background. Trocar Site Hernia (TSH) is defined as an incisional hernia which occurs after minimally invasive surgery on the trocar incision site.In 2004 Tonouchi classified trocar site hernias into 3 types: Early onset type; Late onset type; Special type. Case Report. We report the case of a 76-year old woman that underwent an emergency explorative laparotomy on the 10th p.o. day after a laparoscopic left hemicolectomy. Surgery showed a small bowel herniation through the 12 mm trocar incision site; the intestinal loop appeared necrotic and had to be resected, and the hernia orifice was repaired. We carried out a review of literature about this topic. Discussion. The clinical onset of a trocar site hernia is usually early, occurring within the 30th post operative day and it is caused by the omentum or small bowel entrapment into the trocar orifice. The clinical presentation is insidious, with progression to an acute abdomen, and an emergency surgical approach is often required. Conclusions. TSH is a severe complication of operative laparoscopy especially with large-bore trocar ports. The incidence of TSH resulting from our review ranges from 0.007% to 22% with an average of 1.85%. Prevention of TSH appears to be more effective when trocar insertion through the abdominal wall is tangential, the closure of both the fascia and the peritoneum is performed if the incision is greater than 7 mm, the suture of extra umbilical port site is performed under laparoscopic vision.