Probably not, but ..
The sensitivity of colonoscopy
, on a national level, is estimated to only be, at best 90% (low 90's if you really want to argue the numbers).
Some argue that it is as low as 80%.
What does this mean? If there is a significant mass in 100 patients, 10 will be missed. And not because of foley, it is an imperfect test, yet the best we have.
Speak with your doctor. A mass, anywhere, equals see doc.