Advanced primary abdominal pregnancy with a live birth: a case report

Objectives Advanced primary abdominal pregnancy, an extremely rare condition, poses diagnostic challenges and carries a risk of serious maternal and perinatal complications. In the absence of evidence-based protocols, current management approaches are predominantly guided by anecdotal reports and individual clinical judgment. We report a case of primary advanced abdominal pregnancy in a primigravida. Case presentation A 26-year-old asymptomatic woman at 31 + 6/7 weeks’ gestation was referred for routine third-trimester ultrasonography, which revealed a non-gravid uterus, a viable extrauterine fetus, oligohydramnios, and placental invasion of the right pelvic wall. Magnetic resonance imaging confirmed these findings and demonstrated placental compression of the right ureter with moderate hydroureteronephrosis. A multidisciplinary team was assembled. At 32 + 6/7 weeks, cystoscopic-guided ureteric stenting followed by midline laparotomy resulted in the delivery of a live female neonate. Due to extensive placental vascularity and critical attachments, the placenta was left in situ , and postoperative methotrexate alternating with folinic acid was administered to promote placental involution. The postoperative course was uneventful. Serial follow-up imaging showed progressive placental regression. Conclusions Even when facing a rare, challenging condition, favorable maternal and neonatal outcomes can be achieved through accurate pre-operative diagnosis, early involvement of a multidisciplinary team, thoughtful intra-operative decision-making, and meticulous post-operative care.