i have an unhealthy obsession....

While removing what he thought was a benign growth from a newborn's brain, Colorado physician Dr. Paul Grabb found that the growth contained a tiny foot, a partially formed hand, a thigh and another partially formed foot.

"It would be a shock to even the most experienced pathologist cutting into a tumor to see this," he told the ABC affiliate KMGH.

Grabb said he could not tell whether the miniature limbs were from a benign stem cell tumor called a teratoma or the remnants of an identical twin that did not split off and survive -- a condition called fetus in fetu.

(ABC)