What do we know about Davina McCall's rare brain tumour?

Science correspondent Martin Stew explains television presenter Davina McCall’s surgery to remove a ‘rare brain tumour’. In an instagram video the presenter asked her fans to “say a prayer” for her as she prepared for surgery to remove the benign tumour, known as a colloid cyst. • Subscribe to ITV News on YouTube: http://bit.ly/2lOHmNj • Get breaking news and more stories at http://www.itv.com/news Follow ITV News on Facebook: https://www.facebook.com/itvnews/ Follow ITV News on Twitter: https://twitter.com/itvnews Follow ITV News on Instagram: https://www.instagram.com/itvnews/