Table 1. KSAR Recommendation of Essential Items and Formats for Structured Reporting of Rectal Cancer MRI.
| Reporting Item and Format | Degree of Agreement | |
|---|---|---|
| Technique | ||
| Use of rectal filling (using such as ultrasound gel) | 85.2% (23 of 27) | |
| □ Used | ||
| □ Unused | ||
| Findings | ||
| 1. Distance of lowest tumor margin from anal verge | 96.3% (26 of 27) | |
| □ | ||
| □ Cannot be measured: please specify | ||
| 2. Distance of lowest tumor margin from anorectal junction | 81.5% (22 of 27) | |
| □ | ||
| □ Cannot be measured: please specify | ||
| 3. Tumor relationship to anterior peritoneal reflection | 92.6% (25 of 27) | |
| □ Entirely above anterior peritoneal reflection | ||
| □ Straddling anterior peritoneal reflection | ||
| □ Entirely below anterior peritoneal reflection | ||
| □ Other: please specify | ||
| 4. Circumferential tumor location | 92.6% (25 of 27) | |
| □ Completely encircling lumen | ||
| □ Partially encircling: to o’clock in clockwise manner | ||
| □ Other: please specify | ||
| Most ventral point of rectum is designated as 12 o’clock | ||
| 5. Longitudinal tumor size | 88.9% (24 of 27) | |
| □ | ||
| □ Cannot be measured: please specify | ||
| 6. T stage: | 92.6% (25 of 27) | |
| 7. For ≥ T3 lesion, maximum extramural depth of tumor invasion | 85.2% (23 of 27) | |
| □ ≤ 5 mm | ||
| □ > 5 mm | ||
| □ Other: please specify | ||
| 8. For T4b lesion, involved structures | 100% (27 of 27) | |
| □ Small bowel | □ Bladder | □ Right ureter | □ Left ureter | □ Right seminal vesicle | □ Left seminal vesicle | □ Prostate | □ Uterus | □ Right ovary and adnexa | □ Left ovary and adnexa | □ Vagina | □ Right obturator internus | □ Left obturator internus | □ Right piriformis | □ Left piriformis | □ Right levator ani | □ Left levator ani | □ Right internal iliac vessels | □ Left internal iliac vessels | □ Right external iliac vessels | □ Left external iliac vessels | □ Sacrum/coccyx | □ Other (please specify) | ||
| 9. Shortest tumor distance* from mesorectal fascia or levator (for low tumors close to levator), i.e., risk of CRM tumor involvement | 96.3% (26 of 27) | |
| 10. Anal canal involvement | 88.9% (24 of 27) | |
| □ Absent | ||
| □ Partial thickness of internal sphincter | ||
| □ Full thickness of internal sphincter | ||
| □ Into intersphincteric fat plane | ||
| □ Into external sphincter | ||
| □ Beyond external sphincter and into ischiorectal tissue | ||
| □ Other: please specify | ||
| 11. Mesorectal lymph node spread | 92.6% (25 of 27) | |
| □ Absent | ||
| □ Present | ||
| □ Other: please specify | ||
| 12. Extramesorectal lymph node spread | 96.3% (26 of 27) | |
| □ Absent | ||
| □ Present: □ Right internal iliac | □ Right external iliac | □ Right obturator | □ Right common iliac | □ Right inguinal | □ Left internal iliac | □ Left external iliac | □ Left obturator | □ Left common iliac | □ Left inguinal | ||
| □ Other: please specify | ||
| 13. Extramural venous invasion | 88.9% (24 of 27) | |
| □ Absent | ||
| □ Present | ||
| □ Other: please specify | ||
*Consensus regarding any specific reporting format could not be made (please see “Shortest Tumor Distance from the Mesorectal Fascia or the Levator (Item 9)” section in main text for further explanations). CRM = circumferential resection margin, KSAR = Korean Society of Abdominal Radiology