Ectopic uterine scar pregnancy: A case report.

INTRODUCTION: Implantation of a gestational sac in a previous Caesarean section scar of the lower uterine segment is a rare form of ectopic pregnancy. CASE REPORT: We report a case of Caesarean scar ectopic pregnancy in a 25-year-old female, diagnosed by ultrasonography and confirmed by magnetic resonance imaging. We present the clinical details, imaging findings, and management of the patient. DISCUSSION: Imaging plays an important role in the diagnosis of ectopic pregnancy and ultrasonography is the modality of choice. Ultrasonography features of scar ectopic pregnancy include empty uterus and cervix with normal endometrium and endocervical canal, gestational sac (with embryo and/or yolk sac) in the anterior part of the lower uterine segment in the region of the Caesarean scar with a thin myometrial layer between the bladder wall and gestational sac. Magnetic resonance imaging may be used as an adjunct imaging modality in cases with inconclusive or equivocal sonographic findings. Termination of pregnancy in the first trimester should be considered and treatment options should be individualized as there is no universal agreement on the best or most preferred treatment modality. CONCLUSION: Awareness of specific ultrasound features of scar ectopic pregnancy is crucial for early recognition, correct diagnosis, and initiating prompt management to prevent complications.