"It happens to less than 1 percent of the world's population," Jaffer said.
"The veins don't meet properly, and this is a very rare disorder, that over time pressure builds up in those veins, and you can have a rupture in the vein that then causes blood to pool in the brain," Erik Fisher, Panjwani's doctor, said.
Panjwani also had a stroke and his right side is paralyzed.
"They had to remove part of his skull because the pressure from the aneurysm was building up," Jaffer said.
His aunt said that before the day he collapsed, he didn't have any medical conditions.
"He used to be track manager for the last three years, and he was singing in the choir," Jaffer said.
The high school student goes to the hospital for rehabilitation twice a week so he can walk again. Panjwani told WSB-TV he will be singing and walking soon.
Jaffer said she wants to raise awareness so other parents know more about the disorder.
"Look into how to prevent it. There's no symptoms, it's just a headache. If this could be prevented, that would be really helpful," Jaffer said.
A GoFundMe page has been created to help the family with medical expenses. Over $32,000 has been raised toward its $150,000.