During magnetic resonance imaging, thermal burns are a potential cause of injury. We experienced a rare case of magnetic resonance imaging burn injury caused by jogging pants. The list of materials of the jogging pants did not indicate any metal. However, light, thin metal fibers were used. Changing to suitable magnetic resonance imaging-compatible clothing is important before undergoing magnetic resonance imaging. To minimize the risk of magnetic resonance imaging burns, it is necessary to increase staff awareness and communicate and comply with pretreatment safety checks.

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Objective: We evaluated the risk factors for massive bleeding based on angiographic findings in patients with placenta previa and accreta who underwent balloon occlusion of the internal iliac artery (BOIA) during cesarean section. Methods: We performed a retrospective analysis using the clinical records of 42 patients with placenta previa and accreta who underwent BOIA during cesarean section between 2006 and 2017 in Gunma university hospital. We reviewed incidence of collateral arteries to the uterus on the initial aortography. We evaluated the visualization of the ovarian artery arising directly from the abdominal aorta, round ligament artery arising from the external iliac artery/inferior epigastric artery, and the iliolumbar artery. In addition, the clinical characteristics were reviewed. Patients with an estimated blood loss during delivery of >2500 ml, >4 packed red blood cell transfusions, uterine artery embolization after delivery, or hysterectomy were defined as the massive bleeding group. We compared between the massive and non-massive bleeding groups. Results: 20 patients (48%) had a massive bleeding. No procedure-related severe complications were observed. The massive and non-massive bleeding groups differed in terms of operation time (p < 0.001), hysterectomy (p < 0.001), post-operative hospital stay (p < 0.05), and visualization of round ligament arteries to the uterus [15/20 (75%) patients, p < 0.01]. Conclusion: The incidence of collateral blood supply from a round ligament artery to the uterus may be a risk factor for massive bleeding in patients with placenta previa and accreta who have undergone BOIA during cesarean section. Advances in knowledge: Angiographic visualization of collateral circulation from the round ligament artery to the uterus may be a risk factor for massive bleeding in patients with placenta previa and accreta who have undergone BOIA during cesarean section.