Successful treatment of an advanced interstitial pregnancy by sequential systemic and local administration of methotrexate

Abstract
A patient is presented with an advanced interstitial pregnancy, diagnosed by transvaginal ultrasound and confirmed by laparoscopy. Amenorrhoea at the time of diagnosis was 57 days. Methotrexate was given systemically (4×50 mg i.m.). Because of persisting viability of the fetus, systemic methotrexate treatment was followed by local instillation of methotrexate into the gestational sac (50 mg). Follow-up revealed rapid human chorionic gonadotrophin regression but slow regression of fetal remnants.

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