ESD

Endoscopic Submucosal Dissection (ESD) is an advanced minimally invasive endoscopic procedure used to remove certain early-stage gastrointestinal lesions and tumors in a single piece, without the need for conventional open surgery. It is particularly useful for carefully selected lesions located in the food pipe (esophagus), stomach, and large intestine (colon and rectum). ESD allows the doctor to remove the abnormal tissue precisely while preserving the surrounding healthy digestive tract.

Unlike a conventional endoscopic biopsy or standard polyp removal, where larger or deeper lesions may be difficult to remove completely, ESD enables the removal of a larger lesion along with the appropriate layer of tissue beneath it. This provides a better opportunity for complete removal and allows the removed specimen to be examined accurately by a pathologist.

What is ESD?

ESD stands for Endoscopic Submucosal Dissection. The procedure is performed using a specialized flexible endoscope equipped with a high-definition camera and fine endoscopic instruments. The endoscope is introduced through the natural opening of the digestive tract, usually through the mouth for upper gastrointestinal procedures or through the anus for colon and rectal procedures.

During ESD, the doctor first carefully examines the lesion using advanced endoscopic imaging techniques. The edges of the lesion are identified and marked. A specialized solution may then be injected beneath the lesion to lift it away from the deeper layers of the digestive tract. This creates a safety cushion and helps the doctor work within the correct tissue plane.

A small incision is made around the lesion, followed by careful dissection through the submucosal layer. The lesion is gradually separated from the underlying tissue until it can be removed, usually as one complete specimen. The procedure requires considerable precision because the doctor needs to balance complete removal with preservation of the deeper muscular layer.

When is ESD Recommended?

ESD may be recommended for selected patients with early gastrointestinal cancers or precancerous lesions that are suitable for endoscopic removal. It can be particularly valuable when a lesion is relatively large, has characteristics that make conventional endoscopic removal difficult, or needs to be removed in one piece for accurate pathological assessment.

Common areas where ESD may be considered include:

• Esophageal lesions 
• Stomach lesions 
• Colorectal lesions 
• Certain early gastrointestinal cancers 
• Selected large or complex superficial lesions 
• Lesions where en-bloc removal is important for diagnosis and treatment 

Not every gastrointestinal lesion is suitable for ESD. The decision depends on factors such as the size, location, depth, appearance, and suspected nature of the lesion. Detailed endoscopic evaluation and, when appropriate, imaging or biopsy findings help determine whether ESD is an appropriate treatment option.

How is the ESD Procedure Performed?

ESD is generally performed in a hospital or advanced endoscopy centre under appropriate sedation or anesthesia, depending on the location and complexity of the lesion.

The procedure typically involves several carefully planned steps. First, the digestive tract is examined using a high-resolution endoscope. The lesion is assessed to determine its exact margins and characteristics. Advanced imaging techniques may be used to evaluate the surface pattern and blood vessels.

Once the lesion is assessed, its borders are identified. Fluid is injected beneath the lesion to create separation between the abnormal tissue and the deeper layers. This helps create a working space for dissection.

The doctor then makes a precise incision around the lesion and carefully dissects the submucosal tissue underneath it. Specialized electrosurgical endoscopic instruments are used to separate the lesion while controlling small blood vessels when necessary.

The goal is usually to remove the lesion en bloc, meaning in one piece. Removing the lesion in one piece can be particularly important because it allows the pathologist to examine the complete specimen, including its margins and depth of invasion.

After removal, the area is carefully inspected for bleeding or other complications. If required, blood vessels are treated endoscopically to reduce the risk of bleeding. The patient is then monitored during recovery.

Benefits of ESD

One of the major advantages of ESD is that it can provide an alternative to conventional surgery for appropriately selected early gastrointestinal lesions.

Potential benefits include:

• Minimally invasive treatment 
• Removal of selected lesions without external surgical incisions 
• Possibility of complete en-bloc removal 
• Better assessment of lesion margins by pathology 
• Preservation of the normal anatomy of the digestive tract 
• Generally less disruption to surrounding tissues compared with major surgery 
• Potentially shorter recovery compared with conventional surgery in suitable cases 

Because ESD does not involve an external surgical incision, there may be less postoperative discomfort and a faster return to normal activities for appropriately selected patients. However, recovery varies depending on the location and size of the lesion and the individual’s overall health.

ESD vs Conventional Surgery

Conventional surgery may still be necessary for gastrointestinal cancers that have invaded deeply, involve lymph nodes, or have other characteristics that make endoscopic treatment unsuitable. ESD is not intended to replace surgery in every situation.

The key difference is that ESD is performed through an endoscope and is designed primarily for carefully selected superficial lesions. Surgery may involve removing a larger portion of the affected organ and, in some cases, nearby lymph nodes.

For this reason, deciding between ESD and surgery requires a detailed assessment by a specialist. The safest treatment is determined based on the individual lesion rather than simply choosing the least invasive option.

Recovery After ESD

After ESD, patients are monitored for a period to ensure there are no immediate complications. Depending on the location and extent of the procedure, the doctor may recommend a temporary change in diet before gradually returning to normal food.

Some patients may experience mild abdominal discomfort, throat discomfort after upper gastrointestinal ESD, or temporary changes in bowel habits following colorectal procedures. These symptoms should be discussed with the treating medical team if they persist or become severe.

The removed tissue is sent for detailed histopathological examination. This report is extremely important because it can confirm whether the lesion has been completely removed and whether additional treatment is required.

Why Choose Expert ESD Care?

ESD is a technically demanding procedure that requires specialized endoscopic equipment, detailed lesion assessment, and significant expertise in advanced therapeutic endoscopy. Careful patient selection and proper planning are essential for achieving good outcomes.

At our centre, patients can receive a structured evaluation to determine whether ESD is appropriate for their condition. The treatment plan is based on the lesion’s characteristics, location, suspected diagnosis, and overall health of the patient.

If you have been diagnosed with an early gastrointestinal lesion, a large polyp, or a suspicious abnormality during endoscopy, ask your specialist whether Endoscopic Submucosal Dissection (ESD) could be an appropriate treatment option for you.