Sirenomelia Ruggero Trevisan, MD. Article Published: Oct 29, 2007 Obstetrical and gynecological department, San Bassiano Hospital, Bassano del Grappa, Italy. The following video shows a case of sirenomelia diagnosed at 11 weeks of pregnancy. Video 1: Sorry, your browser doesn't support embedded videos. Discussion Board Start a discussion about this article Add bookmark Bookmarked