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Fetus in fetu
''Fetus in fetu'' (or ''foetus in foetu'') is a developmental abnormality in which a mass of tissue resembling a fetus forms inside the body. There are two theories of origin concerning "fetus in fetu". One theory is that the mass begins as a normal fetus but becomes enveloped inside its twin. The other theory is that the mass is a highly developed teratoma. "Fetus in fetu" is estimated to occur in 1 in 500,000 live births.〔 — source not consulted; cited here following 〕
==Classification as life==
A ''fetus in fetu'' can be considered alive, but only in the sense that its component tissues have not yet died or been eliminated. Thus, the life of a ''fetus in fetu'' is akin to that of a tumor in that its cells remain viable by way of normal metabolic activity. However, without the gestational conditions ''in utero'' with the amnion and placenta, a ''fetus in fetu'' can develop into, at best, an especially well differentiated teratoma; or, at worst, a high-grade metastatic teratocarcinoma. In terms of physical maturation, its organs have a working blood supply from the host, but all cases of ''fetus in fetu'' present critical defects, such as no functional brain, heart, lungs, gastrointestinal tract, or urinary tract. Accordingly, while a ''fetus in fetu'' can share select morphological features with a normal fetus, it has no prospect of any life outside of the host twin. Moreover, it poses clear threats to the life of the host twin on whom its own life depends.〔(【引用サイトリンク】title=Journal of Medical Case Reports | Full text | Fetus in fetu : a case report )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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