Physical visibility/sensitivity of tumors

My dad had been thinking about changing Dr’s for quite some time and went to visit a new Dr today.

Dad had found a couple of nodules in the abdomen and both him and the Dr think they might be tumors. obviously the next step is to get some imaging studies underway to verify.

that said, has anyone experienced any progression and tumor growth that could be felt/seen? i have been looking for any information or studies but have found nothing yet.

if anyone has experienced anything similar or can share anything it would be great. i am nervous about the possibility of sudden growth so having educated opinions will be very helpful.

thanks!

Amilcar