1 in 500,000 Fetus in Fetu

On November 15, a boy was born in Santiago, Chile with a fetus growing inside his stomach. The condition known as "fetus in fetu" is extremely rare (one in 0.5million) with only less than 90 reported cases worldwide. The condition devleops when one twin becomes trapped inside the other and continues to grow during pregnancy. The fetus was 4 inches long with a partially developed spinal cord but no head or limbs. The fetus had no chance of survival and was immediately removed and the boy is recovering from surgury.
http://www.msnbc.msn.com/id/15879296/