Fetus-in-fetu (FIF) is a rarely diagnosed condition. FIF could be considered as a rare differential of teratoma in an infant or young child presenting with progressively increasing abdominal swelling and vomiting. Presence of axial skeleton distinguishes FIF from teratoma; however it can be seen only in 91% of cases on imaging. Both MDCT and MRI findings are useful however MRI provides excellent definition of the salient anatomy without ionizing radiation and should be considered the imaging modality of choice. We emphasize that MRI is a valuable adjunctive tool to sonography for definitive preoperative diagnosis of FIF and surgical planning.

From the manuscript Diagnostic dilemma in a neglected case of fetus-in-fetu solved with Magnetic Resonance Imaging and MDCT - a case report and review of literature by Umesh Chandra Parashari et al.
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