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Indian J Radiol Imaging. 2009 Jul-Sep;19(3):216-8. doi: 10.4103/0971-3026.54890.

Double fetus-in-fetu: CT scan diagnosis in an adult.

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Department of Radiodiagnosis and Imaging Sciences, Dr. Vaishampaiyan Memorial Government Medical College, Solapur, Maharashtra, India.


A fetus-in-fetu (FIF) is an uncommon developmental abnormality characterized by a reasonably well-formed but aborted fetus that is seen in the form of an encapsulated, pedunculated vertebrate tumor in the patient's abdomen. We report an interesting case of a double FIF in a 20-year-old man, who presented with acute abdominal pain and a lump. CT scan of the abdomen revealed two ill-formed fetuses-in-fetu, which were seen as a 15-cm complex, encapsulated mass in the lower retroperitoneum; there was also free fluid in the abdomen. The diagnosis of a ruptured twin FIF was made. Complete surgical excision of the lesion was performed and the diagnosis was confirmed histopathologically. To the best of our knowledge, the CT scan findings of a ruptured double FIF in an adult have not been previously documented.

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