Rectal Cancer MRI Reporting Assistant
Tumor Location (cm from anal verge)
Craniocaudal Level
Low (0-5 cm)
Middle (5.1-10 cm)
High (10.1-15 cm)
Circumferential Location (clock-face position)
12
1
3
5
6
7
9
11
Clock-face reference for describing tumor location (patient supine, viewed from below).
T Category
T1 – Invades submucosa
T2 – Invades muscularis propria
T3a – <1 mm into mesorectum
T3b – 1–5 mm into mesorectum
T3c – 5–15 mm into mesorectum
T3d – >15 mm into mesorectum
T4a – Penetrates visceral peritoneum
T4b – Invades adjacent organs/structures
T Category Reference:
T1 – submucosa
T2 – muscularis propria
T3a – <1 mm into mesorectum
T3b – 1–5 mm
T3c – 5–15 mm
T3d – >15 mm
T4a – visceral peritoneum
T4b – adjacent organs/structures
N Category
N0 – No regional lymph node metastasis
N1a – 1 node
N1b – 2–3 nodes
N1c – Tumor deposits without nodes
N2a – 4–6 nodes
N2b – 7+ nodes
N Category Reference:
N0 – No regional lymph node metastasis
N1a – 1 node
N1b – 2–3 nodes
N1c – Tumor deposits in subserosa or mesorectal tissues
N2a – 4–6 nodes
N2b – 7 or more nodes
Mesorectal Fascia Involvement
No
Threatened
Yes
EMVI (Extramural Vascular Invasion)
No
Yes
Sphincter Complex Involvement
Not Involved
Internal Sphincter
Intersphincteric Plane
External Sphincter or Levator Ani
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