Fetus-in-fetu: Parasite or Neoplasm?
A Study of Two CasesSaito K.a · Katsumata Y.a · Hirabuki T.a · Kato K.b · Yamanaka M.a
Departments of aObstetrics and bPathology, Kanagawa Children’s Medical Center, Yokohama, Japan
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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 ultrasonography at 19 gestational weeks. The pregnancy was terminated, and a postmortem examination revealed six fetiform masses with immature teratoma. Discussion: The tumors may possibly consist of parasitic monozygotic diamniotic twins or highly differentiated teratomas.
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