What is Endoscopic Ultrasound (EUS)?
Endoscopic Ultrasound (EUS) is a sophisticated minimally invasive procedure that combines the visual capability of an endoscope with the tissue-penetrating power of high-frequency ultrasound. A specialised echoendoscope — a flexible tube with both a camera and an ultrasound transducer at its tip — is guided into the gastrointestinal tract to produce high-resolution images of the GI wall layers and adjacent organs such as the pancreas, liver, bile ducts, gallbladder, and lymph nodes.
Unlike conventional CT or MRI scans that image from outside the body, EUS places the ultrasound probe directly adjacent to the organ of interest, providing far greater detail — especially for structures close to the stomach and duodenum. This makes EUS indispensable for staging cancers, evaluating pancreatic lesions, and guiding precise biopsies.
EUS is both diagnostic — producing detailed images and enabling biopsies — and therapeutic, allowing procedures like cyst drainage, celiac plexus block for pain, and bile duct access. All without any surgical incision.
What Types of EUS Does Dr. Ahuja Perform?
EUS-FNA (Fine Needle Aspiration)
A thin needle is passed through the endoscope under real-time ultrasound guidance to aspirate cells from a lesion — pancreatic mass, lymph node, or submucosal tumour — for cytological analysis.
EUS-FNB (Fine Needle Biopsy)
Uses a specialised core biopsy needle to obtain a tissue core rather than individual cells, enabling histopathological assessment and molecular testing — superior accuracy for cancer diagnosis.
EUS-Guided Cyst / Abscess Drainage
Pancreatic pseudocysts and walled-off necrosis are drained by placing a stent between the cyst and the stomach or duodenum under EUS guidance — eliminating the need for surgery.
EUS-Guided Celiac Plexus Block (CPN/CPB)
Injection of anaesthetic/steroid or neurolytic agent into the celiac nerve plexus to provide long-term relief from chronic pancreatic pain or pain from upper abdominal cancers.
EUS-Guided Biliary Drainage (EUS-BD)
When ERCP fails or is not feasible, EUS allows bile duct access via the stomach or duodenum to place a stent and relieve obstructive jaundice — a minimally invasive surgical alternative.
Cancer Staging (T & N Staging)
EUS is the most accurate method for locoregional staging of oesophageal, gastric, rectal, and pancreatic cancers — assessing depth of invasion (T-stage) and lymph node involvement (N-stage).
Conditions Diagnosed & Managed with EUS
Dr. Hardik Ahuja recommends EUS when CT, MRI, or standard endoscopy results are inconclusive, or when a tissue diagnosis or therapeutic intervention is required:
Pancreatic Masses & Cysts
Detailed imaging and biopsy of pancreatic tumours, cystic lesions (IPMN, mucinous cysts), and chronic pancreatitis.
Obstructive Jaundice
Evaluation of bile duct strictures, choledocholithiasis, and hilar cholangiocarcinoma when ERCP is not diagnostic.
GI Cancer Staging
Locoregional staging of oesophageal, gastric, rectal, and ampullary cancers for optimal surgical / oncology planning.
Submucosal Lesions (SMT / GIST)
Characterisation and biopsy of bulges within the GI wall — GISTs, leiomyomas, carcinoids — to guide management.
Chronic Pancreatic Pain
EUS-guided celiac plexus block (CPB) or neurolysis (CPN) for long-lasting pain relief in chronic pancreatitis or cancer.
Pancreatic Pseudocyst / WON
Internal endoscopic drainage of fluid collections after acute pancreatitis — avoids open surgical drainage.
Lymph Node Sampling
Mediastinal, perigastric, and celiac lymph node biopsy for cancer staging and diagnosis of lymphoma or sarcoidosis.
Gallbladder & Biliary Lesions
Gallbladder polyps, microlithiasis, and bile duct wall lesions — EUS provides superior resolution to transabdominal ultrasound.
What Happens During an EUS?
Pre-Procedure Assessment & Consent
Vitals are recorded, current medications reviewed, and informed consent obtained. An IV line is placed for sedation administration. Blood thinners may be stopped prior to the procedure as instructed.
Sedation Administration
Moderate conscious sedation or deeper anaesthesia is given through the IV line. You will be relaxed and comfortable throughout. Oxygen saturation, heart rate, and blood pressure are continuously monitored.
Echoendoscope Insertion & Imaging
The echoendoscope is gently guided through the mouth into the oesophagus, stomach, and duodenum (or through the rectum for lower EUS). High-frequency sound waves produce real-time images of GI wall layers and adjacent organs.
Biopsy / Therapeutic Intervention
If needed, a fine needle is passed under live ultrasound guidance to obtain a tissue sample (FNA/FNB). Alternatively, a stent may be placed for drainage, or a celiac block performed — all in the same sitting.
Recovery & Results Discussion
You rest in the recovery area for 30–60 minutes post-sedation. Dr. Ahuja discusses imaging findings with you before discharge. Biopsy / cytology reports typically arrive in 5–7 working days.
Advantages of EUS
Superior Resolution
EUS places the ultrasound probe directly adjacent to the target organ, providing 4–10× better resolution than transabdominal ultrasound for structures near the GI tract.
Real-Time Guided Biopsy
Tissue sampling with EUS-FNA/FNB is performed under live imaging — far more accurate than CT-guided biopsy for pancreatic and submucosal lesions.
Minimally Invasive
All diagnostic and therapeutic EUS procedures are done through the mouth or rectum — no surgical cuts, minimal discomfort, and same-day discharge.
Diagnosis + Treatment in One
EUS allows the doctor to simultaneously image, biopsy, drain a cyst, or block pain nerves — reducing the need for multiple separate procedures.
How to Prepare for EUS
Upper EUS (via mouth)
- Fast for at least 6–8 hours before the procedure
- Small sips of water are allowed up to 2 hours prior
- Inform Dr. Ahuja of all current medications
- Blood thinners (aspirin, clopidogrel, warfarin) to be stopped 5–7 days before if biopsy is planned
- Diabetic medications may need adjustment — confirm with the team
- Arrange a responsible adult to drive you home after sedation
Lower EUS (Rectal EUS)
- Bowel prep with a laxative the night before (as prescribed)
- Clear liquid diet for 24 hours before the procedure
- An enema may be given at the clinic on the day of the procedure
- Avoid iron supplements 5–7 days before
- Blood thinners may need to be paused if biopsy is planned
- Bring all previous imaging reports (CT, MRI, PET-CT)
Tip: Always carry previous CT scan / MRI reports, previous endoscopy reports, and a list of all current medications on the day of the procedure. This helps Dr. Ahuja plan the EUS more precisely.
Is EUS Safe? What Are the Risks?
EUS is a very safe procedure when performed by experienced endosonographers. Dr. Hardik Ahuja has performed hundreds of EUS procedures with an excellent safety record. The overall complication rate is below 1–2%.
Mild Sore Throat / Bloating
Transient discomfort after upper EUS due to air insufflation. Resolves within hours.
Bleeding (Rare)
Minor bleeding at the biopsy site. Occurs in <1% of cases and is usually self-limiting.
Infection (Very Rare)
Prophylactic antibiotics are given before cyst drainage to minimise infection risk.
Sedation Reactions
Mild in nature. Vital signs are continuously monitored throughout the entire procedure.