What Is Third Space Endoscopy?
Third space endoscopy refers to procedures that access the submucosal layer of the gut wall — the tissue plane just beneath the inner lining — by creating a controlled tunnel through the mucosa, working within this space, and then closing the entry point endoscopically once the procedure is complete. This approach allows a gastroenterologist to remove lesions confined to the lining or submucosa, cut through muscle fibres to relieve obstruction, or in some cases remove and close a full-thickness section of the gut wall, all without an external surgical incision.
The three techniques used most often under this umbrella each serve a different purpose, and the right one depends entirely on what has been found and where:
Endoscopic Submucosal Dissection (ESD)
ESD treatment in Delhi is used to remove flat or early lesions confined to the lining of the gut — including early gastric cancer, early colorectal cancer, and certain precancerous growths — in one continuous piece (en-bloc), rather than in fragments. Removing the lesion whole, rather than piecemeal, is important because it allows accurate pathological assessment of the margins and reduces the chance of the lesion recurring, which is a meaningful advantage over standard polypectomy or endoscopic mucosal resection (EMR) for larger or flatter lesions.
Endoscopic Full-Thickness Resection (EFTR)
EFTR treatment in Delhi is used when a lesion — most often a subepithelial or submucosal tumour such as a gastrointestinal stromal tumour (GIST) — involves the full thickness of the gut wall and cannot be safely removed by working in the submucosal layer alone. The technique removes a full-thickness section of the gut wall containing the lesion and closes the resulting defect endoscopically, avoiding the need for surgical resection in appropriately selected cases.
Per-Oral Endoscopic Myotomy (POEM)
POEM surgery in Delhi is the endoscopic treatment most closely associated with achalasia cardia treatment in Delhi. In achalasia, the muscle at the lower end of the oesophagus fails to relax properly, making swallowing difficult. POEM creates a submucosal tunnel down to the muscle layer, allows the surgeon to selectively cut the tight muscle fibres (myotomy), and then closes the tunnel entry — achieving results comparable to surgical myotomy without any external incision. POEM is also used, less commonly, for certain other oesophageal and gastric motility disorders.
Indications for Third Space Endoscopy
Together, these techniques cover a range of conditions that would otherwise often require surgery:
Early Gastric & Colorectal Cancers
Early gastric or colorectal cancer confined to the lining, suitable for en-bloc endoscopic removal.
Large or Flat Polyps
Large or flat colon and stomach polyps not amenable to standard polypectomy.
Subepithelial & Submucosal Tumours
Subepithelial or submucosal tumours, including suspected GISTs, needing submucosal tumour removal in Delhi.
Achalasia Cardia & Motility Disorders
Achalasia cardia and select oesophageal motility disorders causing difficulty swallowing.
Deeper Wall Lesions
Selected cases requiring full-thickness resection where the lesion involves the deeper gut wall.
How Third Space Endoscopy Differs from Standard Endoscopy
A standard upper GI endoscopy or colonoscopy examines and treats the surface lining of the gut — removing polyps, taking biopsies, or controlling superficial bleeding. Third space endoscopy goes a layer deeper, working within or through the gut wall itself. This allows specialists to remove lesions en-bloc, treat tumours below the surface, or address muscle disorders like achalasia without external surgical incisions.
Essential Pre-Procedure Diagnostic Workup:
- Upper GI endoscopy or colonoscopy to identify and characterise the lesion
- Endoscopic ultrasound (EUS) to assess depth and layer of origin before ESD or EFTR
- High-resolution CT or MR imaging to rule out spread and evaluate surrounding anatomy
- Oesophageal manometry prior to POEM to confirm achalasia diagnosis and subtype
- Targeted biopsies to guide the choice of technique and confirm lesion pathology
- Thorough lesion staging to assess suitability for en-bloc endoscopic removal
Your Treatment Journey: What to Expect
Third space endoscopy procedures are advanced, planned therapeutic interventions rather than same-visit diagnostics. Early GI cancer endoscopic treatment in Delhi is delivered through a structured, multi-step pathway where pathology and imaging guide every stage of care.
- Initial consultation and comprehensive review of prior endoscopy, imaging, and biopsy findings
- Advanced staging with EUS, cross-sectional CT/MRI, or manometry to confirm procedure suitability
- Transparent procedure planning explaining whether ESD, EFTR, or POEM is recommended and why
- Procedure performed under general anaesthesia in a controlled endoscopy or hybrid room
- Short hospital stay for post-procedure monitoring, recovery, and observation
- Detailed pathology review with a structured surveillance and follow-up plan
Safety and What to Expect Afterward
ESD, EFTR, and POEM are technically demanding procedures that carry higher complexity than routine endoscopy. While complication risks (such as bleeding or perforation) are higher than standard endoscopy, they remain generally low when performed by experienced specialists in a dedicated tertiary hospital setting.
- Performed under general anaesthesia to ensure complete comfort and pain-free execution
- Organ-preserving approach that avoids the morbidity of open or laparoscopic bowel resection
- Short, planned hospital stay of one to a few days for close clinical observation
- Personalised guidance on a staged return to normal diet and physical activity
- Strict post-discharge protocols to report any acute pain, fever, vomiting, or bleeding promptly
- Continuous monitoring backed by on-site surgical and intensive care teams
Choosing a Third Space Endoscopy Specialist in South Delhi
Because ESD, EFTR, and POEM require specialised training beyond general gastroenterology fellowship, selecting an experienced specialist ensures higher procedural success and patient safety. Delhi Gastro Care, led by Dr. (Brig) Pankaj Puri at Fortis Escorts Hospital, Okhla Road, provides comprehensive diagnostics, third space endoscopy, and structured follow-up under one roof — readily accessible to patients across Greater Kailash, Saket, Vasant Kunj, Lajpat Nagar, and Nehru Place.
- Led by Dr. (Brig) Pankaj Puri: DM Gastro (PGIMER Chandigarh), FRCP (Edinburgh & London)
- Director of Gastroenterology & Hepatology at Fortis Escorts Liver & Digestive Diseases Institute
- Documented hands-on expertise specifically in ESD, EFTR, and POEM procedures
- Full on-site access to endoscopic ultrasound (EUS), 3T MRI, CT imaging, and anaesthesia backup
- Transparent, honest clinical evaluation comparing endoscopic excision with surgical alternatives
- Structured post-procedure surveillance and histopathology margin evaluation
Frequently Asked Questions
Find clear answers to common questions about Third Space Endoscopy procedures, including ESD, EFTR, POEM, recovery timelines, and eligibility.
Third space endoscopy is a group of minimally invasive techniques — including ESD, EFTR, and POEM — that access the submucosal layer of the gut wall through an endoscope to remove lesions or treat muscle disorders without external surgical incisions.
ESD removes lesions confined to the lining or submucosa of the gut, working within the wall, while EFTR removes a full-thickness section of the gut wall for lesions that extend through it, closing the defect endoscopically afterward.
POEM surgery in Delhi is used mainly for achalasia cardia, a condition where the lower oesophageal muscle fails to relax and causes difficulty swallowing. It cuts the tight muscle endoscopically, without any external incision.
No. While ESD treatment in Delhi is commonly used for early GI cancer, it is also used for large or flat precancerous polyps and certain benign lesions that are difficult to remove with standard polypectomy.
Most patients require a short, planned hospital stay of one to a few days for monitoring after ESD, EFTR, or POEM, depending on the procedure performed and how recovery is progressing.
For appropriately selected, early-stage or confined lesions, yes — it can avoid the need for open or laparoscopic surgery. It is not suitable for every lesion, which is why careful pre-procedure staging and an honest specialist opinion are essential.
Look for a gastroenterologist with verified credentials, documented hands-on experience specifically in ESD, EFTR, or POEM, and on-site access to endoscopic ultrasound, imaging, and surgical backup.
ESD, EFTR, and POEM are performed under general anaesthesia, so patients do not feel pain during the procedure. Some discomfort during recovery is normal and is managed with medication during the hospital stay.