Fetus-in-fetu: Parasite or Neoplasm?

@article{Saito2007FetusinfetuPO,
  title={Fetus-in-fetu: Parasite or Neoplasm?},
  author={Keisuke Saito and Yusuke Katsumata and Tomoo Hirabuki and Keisuke Kato and Michiko Yamanaka},
  journal={Fetal Diagnosis and Therapy},
  year={2007},
  volume={22},
  pages={383 - 388}
}
Introduction: Fetus-in-fetu is a rare congenital fetiform mass whose etiology is still controversial. We report two cases of fetus-in-fetu. Case 1: A fetal retroperitoneal cystic tumor including two masses was detected by ultrasonography at 26 gestational weeks. The masses showed distinctive structures resembling a vertebral axis and were prenatally diagnosed as fetus-in-fetu. A resected specimen revealed two fetiform masses. Case 2: An intracranial tumor with hydrocephalus was detected by… 
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