Colorectal adenocarcinoma

Question 1

Treatment based on colon cancer stage

Answer 1

Question 2

What parts of the colon have retroperitoneal margins?

Answer 2

Ascending and descending, but not transverse or sigmoid.

These margins make up the walls of the paracolic gutters.

Question 3

Local peritoneal involvement grading in colon cancer and associated CAP stage classification

Answer 3

Question 4

1mm rule of thumb

Answer 4

Calling pT4a as within 1mm of the peritoneal surface is a reasonable and validated rule of thumb for colon cancer.

Question 5

Elastin stain to assess for vascular invasion

Answer 5

Makes a lot of false positives – H&E is really a better standard.