ArticleInternational journal of surgery case reports2026
The vertebral axis in retroperitoneal fetus in fetu: a case report on the definitive diagnosis.
Article in International journal of surgery case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Fetus in fetu (FIF) is an exceptionally rare congenital anomaly (1 in 500 000 live births) involving a fetiform mass within a host twin. It is characterized by tissue organization around a vertebral axis rather than the mere presence of three germ layers. Distinguishing retroperitoneal FIF from a mature teratoma is critical, given the latter's malignant potential. Case presentation: A 4-year-old boy presented with progressive abdominal distension. Imaging revealed a 150 × 100 × 136 mm retroperitoneal mass containing calcifications and axial structures, suggesting FIF. The patient underwent a successful Conclusions: Distinguishing FIF from mature teratomas relies on identifying a vertebral axis and organized internal structures. Complete surgical excision is the definitive treatment and is associated with an excellent prognosis. While standard clinical follow-up is sufficient for completely excised, mature FIFs, long-term AFP surveillance may be considered, particularly in cases exhibiting immature elements with malignant potential.
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