From ESPN:

For the second time in this abbreviated NBA season, the Boston Celtics have lost a player to a heart ailment after the team announced Wednesday that forward/center Chris Wilcox will undergo aortic surgery on March 29 and miss the remainder of the season.

An irregularity was first detected last week during a routine screening and follow-up tests confirmed that Wilcox will have to suspend his basketball career. Boston already endured the loss of Jeff Green, who had his contract voided before the season after a routine physical detected an aortic aneurysm.

We wish him the best and hope for a quick recovery.