Fetus‐in‐fetu form of monozygotic twinning with retroperitoneal teratoma

One of the commonest defects of blastogenesis is monozygotic twinning resulting in separate or conjoint twins, the latter including a category of internal, “endoparasitic,” or fetus‐in‐fetu twins. We report the third known instance of endoparasitic twinning associated with a benign teratoma at age 1...

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