Clinical bottom line
Uterine scar pregnancy (CSP), a rare but potentially life-threatening form of ectopic pregnancy implanted in a previous cesarean section scar, demands early and accurate diagnosis coupled with tailored minimally invasive management strategies. Recent evidence highlights advances in imaging modalities and a growing preference for conservative, fertility-preserving treatments such as local injection therapies, uterine artery embolization (UAE), and laparoscopic surgical techniques. These approaches aim to reduce morbidity, preserve uterine integrity, and optimize reproductive outcomes. However, optimal management remains individualized, balancing risks of hemorrhage, uterine rupture, and treatment failure.
What the evidence shows
CSP diagnosis has improved with the integration of advanced transvaginal ultrasound and magnetic resonance imaging, enabling earlier and more precise localization of the gestational sac within the cesarean scar niche (Alzamora-Schmatz et al., 2026). This enhanced imaging capability facilitates differentiation from other ectopic pregnancies and guides management decisions.
Regarding treatment, Bhalwal et al. (2024) critically appraise surgical versus medical approaches, suggesting that while surgery remains a definitive option, minimally invasive techniques are increasingly favored due to lower complication rates and uterine preservation. Local injection therapies, including methotrexate or potassium chloride directly into the gestational sac, have been described as effective first-line treatments, particularly for hemodynamically stable patients (Dolinko et al., 2018).
Adjunctive uterine artery embolization has gained traction as a means to reduce intraoperative bleeding and improve surgical outcomes. Wang et al. (2018) report that combining UAE with hysteroscopic surgery in exogenous CSP cases yields favorable efficacy and safety profiles, with reduced blood loss and shorter hospital stays.
Laparoscopic interventions, including uterine artery ligation and scar excision, represent advanced minimally invasive options. Pandit et al. (2023) and Tong et al. (2014) describe laparoscopic uterine artery ligation as a technique to control hemorrhage and facilitate safe removal of ectopic tissue. Tao et al. (2010) further demonstrate the feasibility of laparoscopic management following UAE, underscoring a multimodal approach.
Farren et al. (2026) provide a comprehensive overview of uterine and extrauterine ectopic pregnancies, emphasizing the importance of individualized treatment plans based on gestational age, vascularity, and patient fertility desires.
Caveats and uncertainty
Despite these advances, CSP remains a relatively rare condition with heterogeneous presentations, limiting large-scale randomized trials. Most evidence derives from retrospective case series and expert opinion, which may introduce selection and reporting biases. The optimal timing and combination of medical and surgical interventions are not standardized, and long-term reproductive outcomes require further study.
Risks of conservative management include incomplete resolution, persistent trophoblastic tissue, and delayed hemorrhage. Surgical approaches, although increasingly minimally invasive, carry inherent operative risks and potential impacts on future pregnancies. The balance between efficacy and safety must be carefully weighed, particularly in patients desiring fertility preservation.
Imaging interpretation requires expertise, and misdiagnosis can lead to inappropriate management. Additionally, access to advanced imaging and interventional radiology may be limited in some settings.
How this may change practice
Clinicians should maintain a high index of suspicion for CSP in patients with a history of cesarean delivery presenting with early pregnancy bleeding or pain. Early referral for advanced imaging can facilitate prompt diagnosis and multidisciplinary planning.
Minimally invasive management strategies, including local injection therapies and laparoscopic uterine artery ligation, may increasingly replace more invasive surgeries, reducing morbidity and preserving fertility. Incorporating uterine artery embolization as an adjunct may enhance safety in select cases.
Individualized treatment algorithms considering patient stability, gestational characteristics, and reproductive goals are essential. Multidisciplinary collaboration among obstetricians, radiologists, and minimally invasive surgeons can optimize outcomes.
Ongoing research and prospective registries are needed to refine protocols, establish standardized guidelines, and evaluate long-term reproductive sequelae.