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Related Experiment Video

Updated: May 23, 2026

Murine Fetal Echocardiography

Murine Fetal Echocardiography

Published on: February 15, 2013

Fetus-in-fetu. Imaging and pathology.

Ahmed M Kurdi¹, Omai M Al-Sasi, Shuaa M Asiri

¹Department of Obstetrics & Gynecology, Riyadh Military Hospital, PO Box 7897, Riyadh 11159, Kingdom of Saudi Arabia. ahmedkurdi@yahoo.com

Saudi Medical Journal

|April 10, 2012

Summary

Fetus-in-fetu is a rare parasitic twin condition where one fetus grows inside the other. This case highlights its antenatal detection and surgical confirmation in a newborn.

Area of Science:

Medical Genetics
Developmental Biology
Teratology

Background:

Fetus-in-fetu (FIF) is a rare congenital anomaly resulting from asymmetric parasitic twinning.
It involves an abnormal embryo developing within the body cavity of its otherwise normal twin.

Observation:

A case of FIF was identified antenatally in a Saudi mother via ultrasound.
The condition presented as an intra-abdominal cystic mass in the newborn male infant.

Findings:

Radiological imaging (X-ray, CT) revealed internal structures suggestive of a fetus, including limbs and a vertebral column.
Pathological examination confirmed the presence of diverse tissues such as brain, gut-like structures, fingers, and limbs, establishing the diagnosis of FIF.

Implications:

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This case underscores the importance of advanced imaging in diagnosing rare congenital anomalies like FIF.
Early detection and surgical intervention are crucial for managing FIF and improving infant outcomes.