She said: "I went for my annual check-up and there was the tumour. It was the size of a large fist.
"[I feared] the worst case scenario ' I only adopted my babies a few years ago and they're still so young. I really believe in God so I started praying like crazy.'
Luckily the 42-year-old personality - who once dated Simon Cowell and has appeared on 'The X Factor' as his assistant - was given the all-clear.
Explaining her relief, she said: "I can only describe it as being born again. I must have been really panicking inside because the relief was so tremendous. All I could think about was my babies and my mum.'
Now she's back to fighting fit, Sinitta has her hopes pinned on a role in the American version of 'The X Factor'.
She told New! magazine: "I told Simon the night before I went into hospital. He was quite stunned but positive.
"I'd love my usual role or a judge's role."
The brunette also hopes she won't be snubbed in favour of judge Cheryl Cole, who is rumoured for a role stateside.
She admitted: "I'd be miserable. The only thing he could do to make it up to me would be to make me a judge on the UK version."