Fetus in Fetu: the Male Pregnancy.

Sanju Bhagat’s said he felt self-conscious about his pregnant belly. OK, kind of pregnant belly since he’s a man:

But while operating on Bhagat, Mehta saw something he had never encountered. As he cut deeper into Bhagat’s stomach, gallons of fluid spilled out — and then something extraordinary happened.

"To my surprise and horror, I could shake hands with somebody inside," he said. "It was a bit shocking for me." …

"He just put his hand inside and he said there are a lot of bones inside," she said. "First, one limb came out, then another limb came out. Then some part of genitalia, then some part of hair, some limbs, jaws, limbs, hair." …

At first glance, it may look as if Bhagat had given birth. Actually, Mehta had removed the mutated body of Bhagat’s twin brother from his stomach. Bhagat, they discovered, had one of the world’s most bizarre medical conditions — fetus in fetu. 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.

Link - Thanks Jim Perry!