Comment on

• Ectopic pregnancy: sonographically-guided transvaginal reduction.

  Shalev E, Zalel Y, Bustan M, Weiner E. Shalev E, et al. Ultrasound Obstet Gynecol. 1991 Mar 1;1(2):127-31. doi: 10.1046/j.1469-0705.1991.01020127.x. Ultrasound Obstet Gynecol. 1991. PMID: 12797087
• Conservative treatment of ectopic pregnancies using a single echo-guided injection of methotrexate into the gestational sac.

  Venezia R, Zangara C, Comparetto G, Cittadini E. Venezia R, et al. Ultrasound Obstet Gynecol. 1991 Mar 1;1(2):132-5. doi: 10.1046/j.1469-0705.1991.01020132.x. Ultrasound Obstet Gynecol. 1991. PMID: 12797088
• Ectopic pregnancy treatment using pelviscopic or vaginosonographically-guided intrachorionic injection of methotrexate and POR 8.

  Popp LW, Mettler L, Weisner D, Mecke H, Freys I, Semm K. Popp LW, et al. Ultrasound Obstet Gynecol. 1991 Mar 1;1(2):136-43. doi: 10.1046/j.1469-0705.1991.01020136.x. Ultrasound Obstet Gynecol. 1991. PMID: 12797089
• Puncture procedures utilizing transvaginal ultrasonic guidance.

  Timor-Tritsch IE, Peisner DB, Monteagudo A. Timor-Tritsch IE, et al. Ultrasound Obstet Gynecol. 1991 Mar 1;1(2):144-50. doi: 10.1046/j.1469-0705.1991.01020144.x. Ultrasound Obstet Gynecol. 1991. PMID: 12797090