He went the eye doctor and they said his eyes were healthy. Then they suggested more tests and they found the tumor in his head and the one in his lung.
This also points out why cancer is so dangerous, by the time you realize you have cancer it could have spread around your body. Especially cancer in parts with lots of blood supply or close to lymph nodes.
I had seminoma testicular cancer. If you must have one, it's what you want. It's very treatable, but also affects the lymphatic system of the body. I had tumors in one testicle and 2 lymph nodes in my abdomen.
Surgery for the testicular tumor, chemo for the others.
It's not that important, it just struck me that something was missing in the description.
that makes sense, thank you for the explanation.