Klippel–Trénaunay Syndrome

Klippel-Trénaunay Syndrome manifests itself in a variety of ways. Dark-colored birthmarks and overactive bone or soft tissue growth are common symptoms of congenital vascular disorder. It can be crippling for many people. Because it frequently manifests in a single limb, it can result in things like fingers or toes fusing. But it turned out to be an odd blessing for Matthias Schlitte, the German Hellboy.

Despite online rumors to the contrary, Schlitte has confirmed that he was born with the condition. And in this case, "this" refers to that arm. Schlitte became a professional arm wrestler as a result of his Klippel-Trénaunay Syndrome, which caused his arm to become unusually muscular. Though he appears to have spent his entire life lifting weights with one arm, the condition is primarily to blame for what has occurred.

He discovered as a child that one arm was simply much stronger than the other. He took up arm wrestling after being encouraged by his mother and has used it to his advantage. His arm grew to 46 centimeters, or about 18 inches in diameter, whereas the average bicep is less than 14 inches.