Abstract
Background: Fetus-in-fetu (FIF) features a monozygotic, diamniotic, parasitic twin enclosed within its host twin. Case report: An 11-month baby girl presented with an antenatal diagnosis of a retroperitoneal mass. Radiological findings suggested it to be a teratoma. The mass was excised in-toto, histological findings were consistent with fetus-in-fetu. Conclusions: FIF may not have identifiable vertebral bodies and limbs upon imaging. Organized organ systems help differentiate this from a teratoma.
Acknowledgments
We sincerely thank Dr Rohit Kapoor (Senior Resident, Department of Pediatric Surgery, Kalawati Saran Children Hospital) and Sekar Lakshmilekiya, (Resident, Department of Pathology, Lady Hardinge Medical College) for their sincere efforts and valuable inputs.
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Disclosure statement
The authors declare that there is no conflict of interest.
Funding
The author(s) reported there is no funding associated with the work featured in this article.