Case Report: PDF OnlyVery Large Yolk Sac and Bicornuate Uterus in a Live BirthCho, Fu-Nan1, *; Kan, Yuen-Yee1; Chen, San-Nung1; Hsu, Pei-Hua1; Yang, Tsung-LungaAuthor Information 1Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, R.O.C. aDepartment of Radiology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, R.O.C. *Correspondence to: Dr. Fu-Nan Cho, Department of Obstetrics and Gynecology, Kaohsiung Veterans General Hospital, 386 Ta-Chung 1st Road, Kaohsiung 813, Taiwan, R.O.C. E-mail: [email protected] Received: January 14, 2005 • Accepted: June 16, 2005 Journal of the Chinese Medical Association: November 2005 - Volume 68 - Issue 11 - p 535-537 doi: 10.1016/S1726-4901(09)70089-9 Metrics Abstract Pregnancies with a very large yolk sac are generally always associated with poor outcomes. Herein, we present a case in which a very large yolk sac (mean diameter, 8.1 mm) and a bicornuate uterus were shown on transvaginal sonography in the first trimester, but which resulted in a live birth. To our knowledge, this is the largest yolk sac among all cases accompanying live births which have been published in the literature. The unusual enlargement of the yolk sac may be secondary to the compensation effect for the poor blood supply in the medial wall of the bicornuate uterus for the conceptus. To predict the outcome of pregnancy, based on this case report, the quality of the yolk sac might be more important than its size. © 2005 by Lippincott Williams & Wilkins, Inc.