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Completely fused lower extremities

Three-dimensional HDlive rendered images at 17 weeks of gestation showing findings consistent with sirenomelia: the lower extremities were completely fused, and the feet were fused with the heels, which were immobile (white dashed arrows). (Source: Sugiura T, Sato Y, Nakanami N, Tsukimori K. Prenatal sonographic image of sirenomelia with anencephaly and craniorachischisis totalis. Case Rep Obstet Gynecol 2018;2018:7058253. Creative Commons Attribution [CC BY 4.0] license, creativecommons.org/licenses/by/4.0.)