Skip to main content

Table 1 Classification system for mrTRG

From: MRI response rate after short-course radiotherapy on rectal cancer in the elderly comorbid patient: results from a retrospective cohort study

Description

Grade

Complete regression (absence of tumour signal and barely visible treatment related scar)

mrTRG 1

Good regression (predominant low signal intensity fibrosis with no obvious areas of intermediate signal intensity)

mrTRG 2

Moderate regression (low signal intensity fibrosis predominates but there are obvious areas of intermediate signal intensity)

mrTRG 3

Slight regression (little areas of low signal intensity fibrosis or mucin but mostly tumor)

mrTRG 4

No regression (intermediate signal intensity, same appearances as original tumor)

mrTRG 5

  1. mrTRG Magnetic resonance tumour regression grade