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Fetus in fetu: a fetiform teratoma
S A Heifetz1, A Alrabeeah, B S Brown
1Department of Pathology, IWK Children's Hospital, Halifax, Nova Scotia.
Pediatric Pathology
|January 1, 1988
Summary
Histologic examination of fetus in fetu revealed vascular pedicle and membranous capsule structures are not umbilical cord or amnion. These findings support the theory that fetus in fetu are complex teratomas.
Area of Science:
- Embryology and Pathology
Background:
- Fetus in fetu is a rare congenital anomaly.
- Previous understanding suggested fetus in fetu structures were derived from umbilical cord and amnion.
Observation:
- Histologic examination of a preoperatively diagnosed retroperitoneal fetus in fetu was performed.
- Unreported histologic features were identified in the vascular pedicle and membranous capsule.
Findings:
- Nervous innervation was observed in both the vascular pedicle and membranous capsule.
- A well-defined lamina elastica interna and vaso vasorum were present in the vascular pedicle artery.
- These findings indicate the structures are not derived from the umbilical cord or amnion.
Implications:
- Provides strong evidence supporting the theory that fetus in fetu represents a complex, well-differentiated teratoma.
- Suggests a re-evaluation of the developmental origins and classification of fetus in fetu.
- Contributes to understanding the relationship between congenital anomalies and teratoma formation.