Conservative and medical management of cervical ectopic and cesarean scar pregnancies

Obstetrics & Gynaecology

Cervical ectopic pregnancy and caesarean scar pregnancy (CSP) are uncommon forms of ectopic pregnancy associated with a substantial risk of severe haemorrhage and maternal morbidity. Cervical ectopic pregnancy occurs when the gestational sac implants within the cervical canal, whereas CSP involves implantation within a previous caesarean delivery scar. CSP has been reported to occur in approximately 1 in 1,008 to 1 in 2,500 pregnancies following caesarean delivery, although estimates vary across studies. Both conditions may initially present without haemodynamic instability but can progress to major bleeding, uterine rupture, and other serious complications. Early diagnosis, primarily through transvaginal ultrasonography, is essential to establish the implantation site and guide management. Conservative and medical approaches may be considered in selected patients, depending on gestational age, clinical stability, ultrasound findings, and reproductive goals. Individualised treatment and close monitoring are crucial to minimise haemorrhagic complications, preserve fertility where feasible, and determine when surgical or other interventions are necessary.[1]Diagnostic assessment and treatment selectionTransvaginal ultrasonography: Confirm the implantation site and assess the gestational sac, cardiac activity, relationship to the uterine cavity, cervical canal, cesarean scar, and surrounding myometriumClinical assessment: Evaluate bleeding, pain, vital signs, hemoglobin, and relevant laboratory findings to determine whether immediate intervention is requiredTreatment individualization: Consider gestational age, serum beta-human chorionic gonadotropin (β-hCG), embryonic cardiac activity, lesion size, myometrial thickness, bleeding severity, and the patient's reproductive goalsSpecialist involvement: Management should involve experienced obstetric and gynecologic clinicians, with access to blood products, anesthesia, and emergency surgical interventionMedical management of cervical ectopic pregnancyMethotrexate: Systemic Methotrexate may be considered in selected hemodynamically stable patients after appropriate assessment. Treatment suitability depends on clinical findings, β-hCG concentration, gestational characteristics, and the absence of contraindicationsLocal treatment: Ultrasound-guided local injection of Methotrexate may be considered in selected cases, particularly when targeted treatment is appropriate. Potassium chloride may be used for embryonic cardiac activity in selected specialist protocols, but it does not independently resolve trophoblastic tissueAdjunctive treatment: Selected patients may require additional procedures, such as ultrasound-guided aspiration or cervical tamponade, to control bleeding or remove persistent gestational tissueFollow-up: Serial β-hCG measurements and repeat ultrasonography should be used to assess treatment response until resolution is confirmed. Persistent trophoblastic activity or significant bleeding requires reassessmentConservative and medical management of cesarean scar pregnancySystemic Methotrexate: Systemic treatment alone is generally not recommended as the preferred approach for cesarean scar pregnancy because treatment failure and serious complications may occurLocal treatment: Ultrasound-guided local injection of Methotrexate or other specialist-directed local therapies may be considered in selected cases. Embryonic cardiac activity and implantation characteristics influence treatment selectionUterine-sparing procedures: Ultrasound-guided vacuum aspiration or hysteroscopic removal may be appropriate in selected patients, depending on the pregnancy's relationship to the scar and the risk of hemorrhage. These procedures should be performed by experienced clinicians with hemorrhage-control resources availableCombined management: Medical treatment may be combined with a procedure or other hemorrhage-control measures when clinically appropriate. Treatment should be selected according to the implantation pattern, clinical stability, and available expertiseMonitoring and complication managementHemorrhage preparedness: Establish a clear escalation plan before initiating conservative treatment because significant bleeding may develop during treatment or follow-upTreatment failure: Persistent or rising β-hCG, ongoing gestational activity, or worsening symptoms should prompt reassessment and consideration of additional treatmentEmergency intervention: Hemodynamic instability, major hemorrhage, or suspected rupture requires urgent resuscitation and definitive intervention rather than continued conservative managementReproductive counseling: Discuss the potential for recurrent ectopic pregnancy, the need for follow-up, and the importance of early ultrasonography in subsequent pregnanciesClinical considerations for follow-upClinical considerationPractical implicationMethotrexate eligibilityReview complete blood count, renal function, liver function, and other relevant contraindications before treatment.Rh statusAssess Rh status and follow applicable guidelines for Rh(D) immune globulin when indicated.Future pregnancyArrange early transvaginal ultrasonography in subsequent pregnancies to establish implantation location.Treatment completionContinue clinical and biochemical follow-up until resolution is documented and symptoms have resolved.ConclusionCSP is increasingly recognised alongside rising caesarean delivery rates and improved imaging, and delayed diagnosis can result in serious maternal and fetal complications. As no single management approach is suitable for every case, treatment should be individualised according to implantation characteristics, gestational age, haemodynamic stability, and reproductive goals. Methotrexate and selected local or uterus preserving procedures may be considered in appropriately selected patients, with careful counselling regarding treatment failure and haemorrhage risk. Accurate diagnosis, early specialist involvement, close monitoring, and structured follow up are essential. Timely escalation to surgical or other definitive intervention is crucial when conservative treatment is unsuitable or unsuccessful, prioritising maternal safety while preserving fertility where feasible.[2]Reference(s):1. Bonetti E, La Fera E, Alesi MV, et al. Conservative management of caesarean scar pregnancy: tissue removal device hysteroscopic treatment after uterine artery embolisation. Facts Views Vis Obgyn. 2025;17(1):90-93. doi:10.52054/FVVO.2024.13678. https://pmc.ncbi.nlm.nih.gov/articles/PMC12042150/2. Stabile G, Vona L, Carlucci S, et al. Conservative treatment of cesarean scar pregnancy with the combination of methotrexate and mifepristone: A systematic review. Womens Health (Lond). 2024;20:17455057241290424. doi:10.1177/17455057241290424. https://pmc.ncbi.nlm.nih.gov/articles/PMC11481064/