Now that doctors finally figured out what was causing Brenden's skyrocketing height, they still had another mystery to solve: how to stop it? And since Brenden is believed to be the only person in the world with the condition, there was no clear-cut answer.
Then, Kletter had an idea that seemed a little crazy -- shots of testosterone to jump start puberty and speed up Brenden's growth. It's puberty, he explained, that signals the body to stop growing.
"We induced puberty," explained Kletter, "to fuse the bones and stop the growth."
And so far, the shots seem to be successful. Brenden's growth has slowed down.
To make life a little easier at home, Brenden's mom had a home built specifically to fit someone of Brenden's enormous proportions.
"It's a lot easier going through the doors and stuff than the last house we had," Brenden said. "The doors are a lot taller and so are the ceilings."
Coincidentally, on the day ABC News visited Brenden's school, his class was working on a soul-searching exercise. Perhaps not surprisingly, Brenden wrote that he wishes people would see "how he's just like everyone else."
Happily, some already do.
"He's really nice and caring," a friend, Tucker, said.
His stepsister, Sierra, added: "He's an extremely good person."
What does the future hold for him?
"It's unknown," said Kletter. "No other case is reported, nothing to look at -- it's an uncharted sea."