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Fetal Diagn Ther. 2007;22(5):383-8. Epub 2007 Jun 5.

Fetus-in-fetu: parasite or neoplasm? A study of two cases.

Author information

1
Department of Obstetrics, Kanagawa Children's Medical Center, Yokohama, Japan.

Abstract

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.

PMID:
17556829
DOI:
10.1159/000103301
[Indexed for MEDLINE]

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