Re: Total colon removal
If this is a separate cancer, not a regrowth of the original it may indicate that you have a condition called Lynch Syndrome. Having two colon/rectal cancers within 9 months is a strong indicator for further testing to see if it is due to a genetic mutation. A sample of the tumor tissue should be tested for microsatellite instability and if microsatellite intability high, further genetic testing is needed.
The reason for removing the entire colon is due to the fact that if any colon remains, a third colon cancer will likely develop and this will avoid the need for repeat major surgeries. People who have Lynch Syndrome or FAP are strongly urged to and often have the entire colon removed to prevent recurrent tumors. Over time, they learn to adjust and live with their new (colonless) normal.