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J Korean Soc Radiol. 2012 Sep;67(3):205-208. English. Case Report. https://doi.org/10.3348/jksr.2012.67.3.205
Kim C , Yoon HK , Cho YA , Hwang JY , Kim AR , Hwang HS , Yoon CH .
Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. chyoon@amc.seoul.kr
Department of Neonatology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
Abstract

Fetus in fetu is a rare, nonviable, malformed parasitic twin, which grows within the body of its partner. It has been known as being almost always anencephalic and rarely reported to have an immature teratoma component. We report a case of a sacrococcygeal fetus-in-fetu with brain tissue seen on both imaging studies and pathologic specimens, containing an immature teratoma component on pathologic examinations. Imaging studies including plain radiography were very helpful for the correct diagnosis.

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