Foetus in fœtu

Fetus is fetu is an extremely rare disorder that is usually diagnosed when the 'host' begins to appear by health problems lodge brother or sister in your lifeless body.
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 similar to that of a tumor, wherein the cells remain viable through normal metabolic activity. However, without the gestational conditions in utero with the amnion and placenta, one 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, as no functional brain, heart, lungs, gastrointestinal tract, or urinary tract . So while a fetus in fetu can share select morphological features with a normal fetus has no prospect of life outside the host twin. Moreover, it represents a clear threat to the life of the host twin who depends on his own life.