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Fetus in fetu.

A M Kajbafzadeh1, M Baharnoori

  • 1Department of Pediatric Urology, The Children's Hospital Medical Center, Tehran University of Medical Sciences, Tehran, Iran.

The Canadian Journal of Urology
|November 2, 2006
PubMed
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Fetus in fetu (FIF) is a rare parasitic twin condition. This case highlights FIF mimicking a renal mass in an infant, emphasizing diagnostic challenges.

Area of Science:

  • Medical Science
  • Pediatric Surgery
  • Radiology

Background:

  • Fetus in fetu (FIF) is an extremely rare congenital anomaly, occurring in approximately 1 in 500,000 live births.
  • It is believed to result from a monozygotic diamniotic twin becoming included within the body of its sibling.
  • FIF typically presents as a fetiform mass, often in the retroperitoneum, within a newborn or infant.

Observation:

  • The case involves a 6-month-old boy presenting with a mass that mimicked a solid and cystic renal tumor.
  • The mass was located in the retroperitoneum, a common site for FIF.
  • Diagnostic imaging revealed features suggestive of FIF, prompting further investigation.

Findings:

  • Histopathological examination confirmed the presence of fetus in fetu within the retroperitoneum.

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  • The specimen showed incomplete development of the parasitic twin, with some identifiable organs.
  • This case underscores the importance of considering FIF in the differential diagnosis of abdominal masses in infants.

    • Implications:

    • Accurate and timely diagnosis of FIF is crucial for appropriate management and surgical planning.
    • Understanding the varied presentations of FIF aids in distinguishing it from other pediatric abdominal masses.
    • This case contributes to the literature on FIF, particularly its presentation as a renal mass mimic.