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The sonographic features that led to the diagnosis of sirenomelia in the remaining fetus included severe renal dysgenesis, persistently apposed lower extremities, and absence of fibulae. Postmortem examination, including angiographic studies of the fetus, revealed caudal dysgenesis and a single umbilical artery that arose from the abdominal aorta. Sirenomelia occurs more frequently in twin gestations than in singletons. This case suggests that the association between twinning and sirenomelia may be greater than is currently recognized. Two hypotheses are given to explain this association.<\/jats:p>","DOI":"10.1002\/tera.1420430202","type":"journal-article","created":{"date-parts":[[2005,6,11]],"date-time":"2005-06-11T14:47:26Z","timestamp":1118501246000},"page":"103-108","source":"Crossref","is-referenced-by-count":32,"title":["Sirenomelia associated with a \u201cvanishing twin\u201d"],"prefix":"10.1002","volume":"43","author":[{"given":"Raj P.","family":"Kapur","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Barry S.","family":"Mahony","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David A.","family":"Nyberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert G.","family":"Resta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas H.","family":"Shepard","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2005,6,2]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/tera.1420360104"},{"key":"e_1_2_1_3_1","unstructured":"Corner G. 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