MRI of rectal cancer
Revision as of 19:06, 14 July 2019 by Rhcastilhos (talk | contribs) (Created page with "{{Top |author1=Rodrigo Horstmann Castilhos |author2= }} == T staging == '''Clinical T staging''' *T1: Limited to submucosa *T2: Invading muscularis prop...")
Author:
Rodrigo Horstmann Castilhos [notes 1]
T staging
Clinical T staging
- T1: Limited to submucosa
- T2: Invading muscularis propria
- T3: Invading pericolorectal tissues (mesorectal fat)
- T4: Invading visceral peritoneum or other organs/structures
- T4a: Penetrates to the surface of visceral peritoneum
- T4b: Directly invades or is adherent to other organs/structures
MRI T staging
- MRI doesn't differentiate T1 from T2
- T1-T2: limited to intestinal wall
- Good prognosis
- Rectal wall has an intact black line (outer muscle) surrounding the tumor
- T3: extramural growth
- T3a or T3b: ≤5 mm extramural growth
- T3c or T3d: >5 mm extramural growth
- T4
N staging
- Important risk factor for local recurrence
Morphologically suspicious characteristics
- Round shape
- Irregular border
- Heterogeneous signal
Malignant node criteria
- Short axis diameter ≥9 mm
- Short axis diameter 5-8 mm + ≥ 2 morphologically suspicious characteristics
- Short axis diameter <5 mm + 3 morphologically suspicious characteristics
- Mucinous lymph node (of any size)
N restaging
MRI protocol
- High resolution
- Contrast medium is optional
- Coronal images parallel to anal canal
- Slice thickness ≤ 3 mm
Treatment
Notes
- ↑ For a full list of contributors, see article history. Creators of images are attributed at the image description pages, seen by clicking on the images. See Radlines:Authorship for details.
References
Beets-Tan RGH, Lambregts DMJ, Maas M, et al. Magnetic resonance imaging for clinical management of rectal cancer: Updated recommendations from the 2016 European Society of Gastrointestinal and Abdominal Radiology (ESGAR) consensus meeting [published correction appears in Eur Radiol. 2018 Jan 10;:]. Eur Radiol. 2018;28(4):1465–1475. doi:10.1007/s00330-017-5026-2
