Fetus in fetu: an institutional experience

Area of Science:

• Medical Imaging
• Pediatric Surgery
• Pathology

Background:

• Fetus in fetu (FIF) is a rare congenital malformation where a parasitic twin is found within the body of its host twin.
• Accurate diagnosis and differentiation from other abdominal masses, such as teratomas, are crucial for appropriate management.

Purpose of the Study:

• To analyze cases of fetus in fetu (FIF) diagnosed at a single institute over a 13-year period.
• To compare the institute's findings with existing published literature on FIF.
• To highlight the diagnostic characteristics and clinical significance of FIF.

Main Methods:

• Retrospective analysis of seven FIF cases diagnosed between January 2000 and December 2012.
• Review of clinical, radiological, and pathological data from hospital records.
• Comparison of collected data with findings from a comprehensive literature review.

Main Results:

• Seven cases of FIF were identified (4 males, 3 females) aged two days to 15 years.
• The retroperitoneum was the most common location, with abdominal mass being the primary presenting feature.
• Radiological findings typically showed a solid-cystic mass, confirmed by pathological examination.

Conclusions:

• The findings align with previously reported literature on FIF.
• FIF should be considered in the differential diagnosis of abdominal masses, particularly in pediatric patients.
• Distinguishing FIF from teratomas is possible through unique clinical, radiological, and pathological features.