Jason Collins, whose NBA career spanned 13 years and six different teams, announced on Thursday that he has Stage 4 brain cancer. Specifically Collins has glioblastoma, a common form of brain cancer that spreads aggressively and quickly.

In an open letter published by ESPN, Collins detailed what led to the diagnosis. He shared how he had difficulty focusing, was struggling to complete simple tasks due to brain fog, and his short-term memory was declining. He underwent a CT scan at UCLA that uncovered the brain tumor.

"What makes glioblastoma so dangerous is that it grows within a very finite, contained space -- the skull -- and it's very aggressive and can expand," Collins said. "What makes it so difficult to treat in my case is that it's surrounded by the brain and is encroaching up

See Full Page