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EMVI Rectal Cancer — SCE Medical Oncology MCQ

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ModerateGI CancersEMVI Rectal CancerSCE Medical Oncology

A 70-year-old man with locally advanced rectal cancer undergoes MRI staging. The report mentions a positive circumferential resection margin (CRM) threat and extramural vascular invasion (EMVI). What is the prognostic significance of EMVI on MRI?

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Correct answer: A — MRI-detected EMVI is an independent adverse prognostic factor associated with higher risk of distant metastases and poorer OS — it influences decisions about neoadjuvant treatment intensity

Extramural vascular invasion (EMVI) detected on MRI is a strong predictor of distant metastatic recurrence and overall survival in rectal cancer. EMVI-positive tumours have approximately 2-3× higher risk of developing distant metastases. It is one of the key factors (alongside T stage, N stage, CRM threat) guiding the intensity of neoadjuvant treatment: EMVI-positive tumours are often treated with more intensive neoadjuvant regimens (TNT) and/or longer intervals before surgery to achieve tumour regression.

Reference: NICE NG151 Colorectal cancer; ESMO 2024 Rectal Cancer; MERCURY Study Group