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Sonographic findings at 13 weeks and 4 days of a DCDA vanishing twin with the second sac containing a nonviable fetus (Case FP2). (a) 3D reconstructed image. Small dead embryo exists in the smaller gestational sac. (b) Crown lump length (CRL) of a nonviable fetus was 20.4 mm, compatible with 8 weeks and 4 days.
