Back جنين داخل الجنين Arabic Foetus in foeto German Fetus in fetu Spanish Fœtus in fœtu French Fetus in fetu ID Fetus in fetu Italian 封入胎児 Japanese 기태류 Korean Fetus in fetu Polish Gêmeo parasita Portuguese

Fetus in fetu

Anteroposterior abdominal radiograph shows a soft-tissue mass in the right hemiabdomen. The mass contains calcified osseous-appearing structures of varying sizes and shapes.
The postoperative specimen from the previous image shows a fairly well developed fetus lying on its back, with rudimentary digits.
A computed tomography scan of the same patient's abdomen pre-operation reveals a large retroperitoneal soft-tissue mass. There are long hyperdense opacities that resemble fetal bones.

Fetus in fetu (or foetus in foetu) is a rare developmental abnormality in which a mass of tissue resembling a fetus forms inside the body of its twin. An early example of the phenomenon was described in 1808 by George William Young.[1]

There are two hypotheses for the origin of a "fetus in fetu". One hypothesis is that the mass begins as a normal fetus but becomes enveloped inside its twin.[2] The other hypothesis is that the mass is a highly developed teratoma. "Fetus in fetu" is estimated to occur in 1 in 500,000 live births.[3]

  1. ^ Young GW (1808). "Case of a Fœtus found in the Abdomen of a Boy". Medico-Chirurgical Transactions. 1: 236–264. PMC 2128792. PMID 20895115.
  2. ^ Chua JH, Chui CH, Sai Prasad TR, et al. (2005). "Fetus-in-fetu in the pelvis" (PDF). Annals of the Academy of Medicine Singapore. 34: 646–9. Archived from the original (PDF) on 2007-10-11.
  3. ^ Grant P, Pearn JH (May 1969). "Foetus-in-foetu". The Medical Journal of Australia. 1 (20): 1016–1019. doi:10.5694/j.1326-5377.1969.tb49866.x. PMID 5815070. S2CID 209072187. — source not consulted; cited here following Hoeffel CC, Nguyen KQ, Phan HT, Truong NH, Nguyen TS, Tran TT, Fornes P (June 2000). "Fetus in fetu: a case report and literature review". Pediatrics. 105 (6): 1335–1344. doi:10.1542/peds.105.6.1335. PMID 10835078.

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