(NPR) – Both men had surgery to remove a brain arteriovenous malformation, a tangle of abnormal blood vessels prone to bleeding.

Both men suspect that their condition was linked to their years as Marine gunners exposed to repeated blast waves from the anti-tank weapons they fired.

That two Marines who did the same job in the same time period [the 1990s] would both be diagnosed with AVMs is “highly unlikely,” Wilcox says. (Read More)