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First trimester diagnosis of sacrococcygeal teratoma using two‐ and three‐dimensional ultrasound

Sacrococcygeal teratomas are very rarely diagnosed in the first trimester. Here we report a case of a presacral mass suggestive of a sacrococcygeal teratoma that was detected during the first trimester nuchal translucency thickness measurement at 12+1 week of gestation. Although the diagnosis was possible with conventional two‐dimensional sonography, three‐dimensional sonography facilitated prenatal counseling by providing more recognizable images to the parents. Postmortem examination of the fetus confirmed the presence of a type 2 benign immature teratoma. © 2011 Wiley Periodicals, Inc. J Clin Ultrasound, 2011