Horrible setback for ex-NBA commissioner David Stern -- who is now in critical condition after undergoing emergency brain surgery.
77-year-old Stern has been hospitalized since Thursday when he suffered a sudden brain hemorrhage at a Manhattan restaurant.
It seems things had stabilized ... but now, The Athletic's Shams Charania says Stern suffered ANOTHER brain hemorrhage, requiring emergency surgery.
The NBA has issued a statement on Stern ... saying, "He is receiving great care and surrounded by his loved ones."
"The Stern family and everyone at the NBA appreciate the incredible outpouring of support.