How rare is colon cancer in the form of a ring?

Answer by  Bubba49 (177)

Colon cancer in the form of a ring is very common when the cancer is discovered in an moderately advanced stage. Because the cancer has grown to surround the bowel wall, it is usually a somewhat advanced stage. This often causes obstruction of the bowels and constipation which leads to discovery.

Answer by  Bubba49 (177)

The particular shape of the tumor is much less important than cell type and stage of the disease. It is not a rare lesion and can be 30% of total.