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Appearance of fused limbs in fixed extension with two femora and two tibiae

The lower limbs appeared to be fused together in fixed extension with two femora and two tibiae (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.)

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