Select the pathological sub-class to visualize the ESD curative outcome.
Guidelines & Evidence
Clinical Details
Section 1
When to Use
When to Use
Selection of the optimal endoscopic resection technique for GI neoplasia (Oesophageal, Gastric, or Colorectal)
To differentiate between Endoscopic Mucosal Resection (EMR) and Endoscopic Submucosal Dissection (ESD)
Evaluating specialized imaging findings (NBI, LCI, Chromoendoscopy) to predict depth of invasion
Clinical Objective
The goal of EMR/ESD is curative "R0" resection of superficial neoplastic lesions while avoiding the morbidity of surgical organ resection (e.g., gastrectomy or esophagectomy).
Section 2
Formula & Logic
Technique Definitions
01
EMR (Endoscopic Mucosal Resection): Uses a snare to "cap-and-cut" or "ligation-cut" lesions. Typically limited to ≤ 15–20mm for en-bloc removal.
02
ESD (Endoscopic Submucosal Dissection): Uses specialized knives to dissect the submucosa directly. Allows for en-bloc resection of large lesions regardless of size.
The Paris Classification Correlation
Type 0-Ip (Pedunculated)
Ideal for EMR (Snare polypectomy)
Type 0-Is (Sessile)
EMR if < 20mm; consider ESD if larger
Type 0-IIa/b/c (Flat)
ESD preferred for en-bloc pathological assessment
The SM (Submucosal) Invasion Rule
SM1 (< 500µm invasion): Potentially curable by ESD/EMR
SM2 (> 500µm invasion): High risk of lymph node metastasis; mandates surgical resection
Section 3
Pearls/Pitfalls
Why En-Bloc Matters
EMR for large flat lesions often results in "piecemeal" resection. This significantly increases the risk of local recurrence (up to 15–20%) and makes pathological staging of invasion depth difficult. ESD provides an "en-bloc" specimen (all in one piece), which is the pathological gold standard.
Predicting Invasion (JNET/Kudo Patterns)
NBI patterns (Type 2B or 3) or Kudo Pit Patterns (Type V) suggest deep submucosal invasion. Lesions with these patterns should be referred directly for surgery as endoscopic resection will not be curative.
Clinical Pearls
Oesophageal SCC: ESD is mandatory for lesions > 10mm to ensure accurate grading of mucosal vs. submucosal invasion
Gastric Cancer (Early): ESD is the standard of care for differentiated intramucosal adenocarcinoma without ulceration (Expanded Criteria)
Complications: ESD has a higher risk of perforation and longer procedure time compared to EMR
Section 4
Next Steps
Resection Outcome Evaluation
01
R0 Resection + Low Risk: Surveillance endoscopy in 3-12 months.
02
Piecemeal / Positive Margin: Consider repeat ablation or surgical referral.
03
Deep SM Invasion (>500µm) on Pathology: Mandatory referral to Oncology/Surgery for lymph node dissection.
Complementary Scoring
Paris Classification (Morphology)
Kudo Pit Pattern Interpretation
Prague C&M Criteria (Barrett's)
Section 5
Evidence Appraisal
The European Standard
Endoscopic submucosal dissection: European Society of Gastrointestinal Endoscopy (ESGE) Guideline.
Pimentel-Nunes P et al. • Endoscopy. 2015;47(9):829-54. The definitive roadmap for ESD vs. EMR selection.
ESD was pioneered in Japan in the late 1990s (Gotoda et al.) to address the high incidence of gastric cancer. It represented a paradigm shift in interventional endoscopy, moving from simple snare resection (EMR) to a microsurgical technique that replicates surgical planes.
