A four-year-old boy who repeatedly returned to hospital with severe leg pain was diagnosed with a rare stage four cancer after his symptoms were initially thought to be constipation or arthritis . Theo Lock, four, had only just started primary school when he began suffering from severe pain in his legs. The pain quickly became severe and prevented him from walking properly. Theo’s mum, Jess Horne, repeatedly took him to hospital as she searched for answers. The family were initially told his