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Related Experiment Video

Updated: Jun 19, 2026

A Mouse Model of in Utero Transplantation

A Mouse Model of in Utero Transplantation

Published on: January 27, 2011

Fetus-in-fetu.

Babajide O Balogun¹, Michael A Bankole, Rachael A Akinola

¹Department of Radiology, Lagos State University Teaching Hospital, Ikeja, Lagos, Ikeja.

African Journal of Paediatric Surgery : AJPS

|October 28, 2009

Summary

Fetus-in-fetu (FIF) is a rare condition where a malformed twin fetus is found inside its sibling. This case highlights FIF presenting as a mesenteric cyst in an infant, emphasizing diagnostic challenges.

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Published on: October 25, 2015

Area of Science:

Medical case study
Developmental abnormalities
Surgical pathology

Background:

Fetus-in-fetu (FIF) is a rare congenital anomaly where a malformed twin fetus is enclosed within the body of its host twin.
This condition often presents diagnostic challenges, mimicking other intra-abdominal masses.

Purpose of the Study:

To report a rare case of fetus-in-fetu.
To discuss the diagnostic considerations and imaging modalities for this condition.

Main Methods:

Case presentation of a 3-month-old female infant.
Diagnostic work-up including imaging (details not specified in abstract).
Surgical exploration and identification of the mass.

Main Results:

Initial diagnostic work-up suggested a mesenteric cyst.
Surgical findings revealed the mass to be a fetus-in-fetu.
This highlights a discrepancy between preoperative diagnosis and surgical findings.

Conclusions:

Fetus-in-fetu can present atypically, mimicking common pediatric surgical conditions like mesenteric cysts.
While advanced imaging like CT and MRI offer high sensitivity, conventional methods such as plain radiography and ultrasonography remain valuable in the preoperative assessment of FIF.
Early and accurate diagnosis is crucial for appropriate surgical management.