3 months? Really, he was in a facility that also performs colonoscopies and such but he didn't mention it to the doctors, interesting huh?
CT's are always inconclusive, they can detect a mass; however, the type of mass, depending if it is internal or external to the G.I. wall will be determined by biopsy, usually performed in a colonoscopy. Doing a cancer "stain" will take about a day after the actual biopsy.
If it is a "tumor" that is benign then it's as simple as snip-snip, connect, and close. If not then... depending on the position and age of the "tumor" a round of chemo is called for and maintenance for 6 to 12 month periods for a few years. If it has spread, well, I would not like to think of it personally. I can say that colon cancer is quite treatable in early stages.
I would like to know who his GP is, a male 40 and older should be getting regular prostate exams, and since there is a history, a colonoscopy/virtual colonoscopy every 1 to 2 years (at least).
All we know is there is a blockage either from the "tumor" or inflammation from the "tumor", all this speculation is stupid in my opinion, all it's doing is making money with ad space, and possibly diverting, using victimization, in the cause of the Ford bros. Robbie is not a god or saint, stop treating him as such; people deal with shit every hour of everyday, and they are no less important.
It's interesting how many people have practically pronounce Robbie dead, or how they have externalized their latent hypercondria.