A 55-year-old man has a 5 cm rectal cancer located 8 cm from the anal verge on rigid sigmoidoscopy. MRI pelvis shows T3 N1 disease with a circumferential resection margin (CRM) of 1.5 mm. The most appropriate initial management sequence is:

• A Total mesorectal excision (TME) followed by adjuvant chemoradiation
• B Short-course radiotherapy (25 Gy/5 fractions) with immediate surgery
• C Long-course neoadjuvant chemoradiation (45–50.4 Gy) followed by TME after 6–8 weeks ✓
• D FOLFOX chemotherapy followed by MRI restaging, then surgery

Explanation

For locally advanced rectal cancer (T3-4 or N+) with threatened or involved CRM (<1 mm), long-course neoadjuvant chemoradiation (fluorouracil-based sensitization during 45-50.4 Gy) followed by TME after 6-8 weeks is the standard of care per ESMO/ASCRS guidelines. This approach achieves tumor downstaging, increases R0 resection rates, and may allow sphincter preservation. Short-course RT (25 Gy/5 fractions) is used for CRM-negative T3 disease or as a bridge to surgery in elderly/frail patients. A CRM of 1.5 mm is considered threatened (high risk for involved margin) and warrants maximal downstaging.

Reference: Bailey & Love's Short Practice of Surgery, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.