Former NBA center Jason Collins has Stage 4 glioblastoma, he revealed Thursday.

In September, the NBA announced Collins was undergoing treatment for a brain tumor. On Thursday, however, the 13-year NBA veteran shared more details about his diagnosis, treatment and prognosis.

“But now it’s time for people to hear directly from me,” Collins told ESPN’s Ramona Shelburne . “I have Stage 4 glioblastoma, one of the deadliest forms of brain cancer. It came on incredibly fast.

“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. What makes it so difficult to treat in my case is that it’s surrounded by the brain and is encroaching upon the frontal lobe -- which is what makes you, ‘you,’ he added.

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