Rare Anatomy: Blood

S1 E8: Twelve-year-old Son Pham's face has been taken over by a huge balloon-like mass, caused by abnormal blood vessels. The severity of his condition is so staggering that leading specialists have designed a complex, years-long treatment program specifically for him. National Geographic follows as Son undergoes an invasive and risky procedure, part of a series designed to diminish the malformation. Sixteen-year-old Michael Politzer's vascular system has spread into a labyrinth that mangles and reshapes his organs, causing bone and tissue overgrowth. Follow Michael as he tries to live like a normal teenager, while fighting the continuous attacks of his own body that have forced him to have amputations and his spleen removed.