Figure 1: A size 10 Foley’s catheter was inserted into the uterine cavity, distended with 10 mL of methylene blue, and left in situ. At laparotomy, neovascularisation that radiated like spider nevi was observed in the right cornu where only the serosal surface of the uterus separated the intrauterine balloon without any intervening myometrium. It was evident that this site would have been the site of previous cornual rupture forming an endometrial-peritoneal fistula.