Hi, my mom is 81 yrs. old. She gets out of breath just walking a few steps.. She's on dialysis three times a week for three hrs. She has pneumonia for about a month and she has had x-rays done on her lungs when she went in to have blood work done (she's on warfarin). The doctor didn't like the looks of the x-rays and had her take a CT scan. They found a knot on her lung. She'll be seeing a lung doctor next week. Should I be concern she might have cancer?