Transvaginal ultrasound-guided local methotrexate administration as the first-line treatment for cesarean scar pregnancy: Follow-up of 18 cases.

Cesarean scar pregnancy (CSP) is a rare type of ectopic pregnancy, which occurs in previous cesarean section scar tissue, with an incidence of 1 in 1800-3000 pregnancies. Transvaginal ultrasound-guided local methotrexate (MTX) administration presents as a non-systemic option with possible better penetration to the pregnancy site. We present the management of 18 patients with CSP solely by transvaginal ultrasound-guided local MTX administration. All patients were treated with local MTX with a dose of 50 mg/m(2) . Eleven (61.1%) of the patients did not need any further intervention. Four patients (22.2%) were treated with additional single-dose systemic MTX due to inadequate alteration in blood β-human chorionic gonadotrophin levels. Three patients (16.7%) required hysteroscopy and/or laparotomy. We suggest that transvaginal ultrasound-guided local MTX treatment may be considered as a first-line treatment for CSP.