Saudi Arabian doctors said they witnessed a unique case during their experience when they found a year-old girl pregnant.
A team of doctors traced the biological processes to find out how a baby girl could be heavy with a baby.
It turned out that the mother of the pregnant baby originally had two embryos with one began to develop in the uterus of the other fetus.
Doctors are in consultations about the abortion to save the live-born baby.
About 51 similar incidents have been recorded in medical history although incidence rate is not high. The abnormality occurs in 1 in 500,000 live births.
In June 1999, the case of Sanju Bhagat a man from Nagpur, India attracted attention for the length of time (36 years) he had carried his parasitic "twin" inside his body, and the size of the growth.
Doctors were certain that the man had a gigantic tumor in his belly. However, they found fragments of human genitalia, hairs, limbs and jaws in the patient and finally removed a weird underdeveloped creature having legs and arms with long nails.
In 2002, Indian doctors found a six-month-old boy to have a fetus inside. The dead fetus, which surgeons removed from the boy, weighed one kilo, whereas the boy himself weighed 6.5 kilos.
One of the world’s most bizarre medical conditions is known as fetus in fetu. Believed to happen in an early stage of pregnancy, this is a rare condition in which a fetiform calcified mass often is present in the abdomen of its host, a newborn or an infant.
It is an extremely rare abnormality that occurs when a fetus gets trapped inside its twin. The trapped fetus can survive as a parasite even past birth by forming an umbilical cordlike structure that leaches its twin’s blood supply until it grows so large that it starts to harm the host, at which point doctors usually intervene.
Doctors point to this case as an unequal division of totipotential cells of a blastocyst where the result is the inclusion of a small cellular mass in the more mature embryo.
This is a form of monozygotic diamniotic twin pregnancy where the parasitic twin installs and grows in the body of its partner.
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 inherently limited to that of an invasive tumor. In principle, its cells must have some degree of normal metabolic activity to have remained viable. Farsuna