Endoscopic Submucosal Dissection (ESD) represents one of the most significant advances in the treatment of early digestive cancer in recent decades. This Japanese technique, which began developing in the 1990s, has completely revolutionized the therapeutic approach to early neoplastic lesions, enabling curative treatments without the need for traditional surgery.

What is Endoscopic Submucosal Dissection?

ESD is a minimally invasive endoscopic technique that allows complete resection in a single piece of precancerous lesions and very early cancers of the gastrointestinal tract. Unlike conventional endoscopic mucosal resection, ESD allows addressing larger and more complex lesions, guaranteeing free resection margins and precise histopathological evaluation.

This technique is based on creating a dissection plane in the deep submucosa, using instruments specifically designed for this purpose. The procedure requires exceptional technical skill and deep anatomical knowledge of the digestive wall layers.

Real Clinical Cases: Exceptional Results

In our clinical practice, we have documented complex cases that demonstrate the superior efficacy of ESD compared to conventional techniques. The following cases perfectly illustrate the advantages of this Japanese technique:

The Japanese Technical Revolution

The development of ESD in Japan was not coincidental. The high incidence of gastric cancer in the Japanese population motivated the search for less invasive alternatives to gastrectomy. Pioneers like Yahagi, Saito, and Ono developed specific instruments (IT knife, Flex knife, Hook knife) and standardized protocols that made this technique the worldwide gold standard.

ESD vs Traditional Surgery: Technical Comparison

Precise ESD Indications

Proper patient selection is fundamental for ESD success. Oncological indications include:

Surgical Technique: Fundamental Steps

ESD requires a rigorous technical protocol that includes multiple critical stages:

1. Preoperative Endoscopic Evaluation: Chromoendoscopy with indigo carmine, narrow band imaging (NBI) and magnification to delineate tumor margins and evaluate submucosal invasion.

2. Margin Marking: Circumferential electrocoagulation with 2-5mm safety margin according to location and histology.

3. Submucosal Infiltration: Saline solution with epinephrine 1:500,000 (optional), occasionally with indigo carmine as blue dye +- hyaluronic acid or other viscous solutions to maintain tissue elevation.

4. Mucosal Incision: Initial circumferential incision with electrocautery, creating access to the submucosal plane.

5. Submucosal Dissection: Meticulous dissection in deep submucosa, identifying and preserving the proper muscle layer. Preventive hemostasis of submucosal vessels.

6. Resection and Evaluation: En-bloc specimen extraction, formalin fixation and immediate macroscopic evaluation.

Complications and Management

Although ESD is a safe technique, it requires specific experience to minimize complications:

Perforation (2-5%): The most feared complication, generally manageable with endoscopic clips if smaller than 10-15mm. Larger perforations may require endoscopic suturing or surgical treatment.

Bleeding (3-7%): Immediate bleeding controllable with electrocoagulation. Delayed bleeding (24-72h) is less frequent but requires hospital surveillance and is somewhat higher in stomach or rectal lesions.

Stenosis (1-3%): More frequent in esophageal and rectal resections involving >75% of circumference. Preventable with mucosal preservation techniques.

The Future of ESD: Perspectives and Developments

ESD continues to evolve with new instruments, traction techniques, and injection systems that facilitate the learning curve. The integration of artificial intelligence for automatic margin delineation and prediction of submucosal invasion promises to further revolutionize this technique.

In Spain, ESD is experiencing gradual but steady expansion. Structured training, international mentoring programs, and availability of specific instruments are democratizing this technique that was previously exclusive to ultra-specialized centers.