Zen, the 5-month old son of Nick Cannon, has died of brain cancer

Nick Cannon's youngest son, Zen, has died from a form of brain cancer, the entertainer tearfully announced Tuesday on The Nick Cannon Show. 

Cannon said Zen at first seemed to have "like a sinus thing, it was like a cough, and I just wanted to check it out."

"He always had this real interesting breathing. And by the time he was two months ... I also noticed he's got like a nice-sized head — I call it a Cannon head. ... We didn't think anything about it," he said. "But I wanted to take him to the doctor for his sinus and breathing. So we thought it would be a routine process."