Rectal MR – David Lisle
26 July @ 10:45 - 11:30
Rectal cancer is a common malignancy and represents a large ongoing health issue. First described in 1986, MR for the staging of rectal cancer has evolved into a highly accurate and clinically relevant imaging tool. MRI is vital in the selection of therapy, and increasingly, in monitoring treatment response. This lecture will illustrate the many features that can be appreciated on MRI, including:
• Distance of tumour from the anal verge, and relationship to the anterior peritoneal reflection
• T stage of the tumour, including depth of invasion beyond the rectal wall, and involvement of adjacent organs
• Morphological features of lymph nodes and N stage
• Extramural venous invasion (EMVI) and whether it is continuous or discontinuous
• Involvement of the potential circumferential resection margin (CRM)
• Involvement of pelvic sidewall lymph nodes outside the mesorectum.
The method of restaging of rectal tumour post radiotherapy will also be outlined, including illustration of the tumour response grading (mrTRG) system.