Win an All-Access Pass!
Become a new yearly Curie (Radium) or Roentgen (Gold) Radiopaedia Supporter during December and be in the running to win one of four 12-month All-Access Passes. Find out more.

Fetus in fetu

Case contributed by Dr Zaidah Mohd Ismail


Abdominal mass since birth associated with sudden onset of severe abdominal pain.

Patient Data

Age: 15 years
Gender: Male

An intraperitoneal malformed fetus in a sac. Malformed skull vault, limbs, teeth and vertebrae are visualized.

Case Discussion

Total removal of the malformed fetus was performed and confirmed to be fetus in fetu.

Fetus-in-fetu is a rare benign condition in which a non viable fetus is found in the body of its twin.

It is extremely rare with an incidence of 1:500,000 births. It is a type of monozygotic diamniotic twin.

Differential diagnosis is organized teratoma. Total excision of this malformed fetus is a definite cure.

PlayAdd to Share

Case information

rID: 50848
Published: 26th Jan 2017
Last edited: 4th Feb 2020
Inclusion in quiz mode: Included

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.