Successful treatment of advanced interstitial pregnancy with methotrexate and hysteroscopy. A case report.

BACKGROUND: Data concerning medical treatment of interstitial ectopic pregnancies are scarce. These pregnancies are characterized by late and serious clinical manifestations. We report a case of advanced interstitial pregnancy treated successfully by combining methotrexate (MTX) and hysteroscopy.

CASE: A routine ultrasonic evaluation of a 10-week pregnancy revealed a right interstitial gestational sac 58 mm in diameter and containing an embryo with a crownrump length of 29 mm and embryonic heartbeats. Serum beta-human chorionic gonadatropin (hCG) level was 97,950 mIU/mL. The patient was treated with a systemic MTX/leucovorin regimen. At the end of the one-week course, no embryonic cardiac activity was detected, and a decrease in beta-hCG levels commenced. Persistent trophoblastic tissue, manifested by a low (26 mIU/mL) beta-hCG level in plateau, was successfully removed by way of hysteroscopy.

CONCLUSION: Early detection of interstitial pregnancy may facilitate conservative medical treatment.