A young woman has urged patients not to take no for an answer if they're unhappy with a diagnosis — after her leg pain that was dismissed as a 'sprain' turned out to be a rare type of tumour.

Symptoms Dull or sharp pain Swelling or a noticeable lump behind the knee Stiffness or ... Radiating pain around the area Numbness or tingling in the lower leg if nerve affected Accumulation ...