International Journal of Academic Health and Medical Research (IJAHMR)   Year: 2023 | Volume: 7 | Issue: 1 | Page No.: 81-84 TRAP Sequence: A Case Report. Download PDF I. Alilou, M.A.El Moctar, K.Saoud, N.Mamouni, S. Erraghay, C. Bouchikhi, A. Bannani Abstract: Acardiac mass or TRAP sequence is a rare and serious pathology of monochorionic pregnancy. Its frequency is 1/35 000. During this pathology one of the two twins has no heart, and its vascularization is ensured against the current by the second one via very wide arterial and venous anastomoses, responsible for a hemodynamic imbalance. The diagnosis must be made in the first trimester and the evolution can easily be made towards the high flow heart failure of the "Pump" twins, justifying a follow-up every 15 weeks, which will be even closer if signs of heart failure set in. Diagnosis and follow-up are based on ultrasound with fetal Doppler studies. We report the case of a twin pregnancy with TRAP sequence discovered on ultrasound at 23 weeks of amenorrhea, with delivery at 27 weeks.