Hi there, has anyone had a 5cm or larger tumour in rectum/anal that has turned out to be benign? 

ive just had the news I have a 5.3x2.5cm tumour in my rectum/anal canal. CT with contrast and MRI show it has grown through wall of bowel. Liver looks clear. They are going to CT my lungs to check. 

Biopsies of tumour will be taken in colonoscopy under general in a few days but I just wondered (clinging on to hope I suppose!) if ther could still be a chance this is benign? All my bloods, FIT test, Calprotectin have all been fine. 

Despite pain I've had very few symptoms really compared to most. 

Any advice or shared stories would be so appreciated. And any questions I should ask my surgeon. 

thank you! 
M