Endoscopic Ultrasound (EUS)
Endoscopic Ultrasound (EUS) is an advanced procedure that combines endoscopy and ultrasound to obtain detailed images of the digestive tract and nearby organs.
What is EUS?
Endoscopic Ultrasound (EUS) is a specialized procedure that combines:
- Endoscopy → a thin flexible tube with camera
- Ultrasound → sound waves to create detailed images
It helps doctors see the digestive tract and nearby organs from very close range, giving much clearer images than a normal abdominal ultrasound.
Which Organs Can Be Examined?
EUS can evaluate:
- Food pipe (esophagus)
- Stomach
- Duodenum/small intestine
- Rectum & colon
- Pancreas
- Gallbladder
- Bile ducts
- Liver
- Lymph nodes
- Mediastinum/chest structures
Why is EUS Done?
Common Indications
Pancreatic Diseases
- Pancreatitis
- Chronic pancreatitis
- Pancreatic cyst
- Pancreatic tumor/cancer
Gallbladder & Bile Duct Problems
- Small gallstones/sludge
- CBD stones
- Obstructive jaundice
Cancer Evaluation
- Staging of GI cancers
- Checking lymph node spread
- Detecting small tumors
Unexplained Symptoms
- Persistent abdominal pain
- Weight loss
- Recurrent vomiting
- Unexplained jaundice
Abnormal Imaging Reports
If CT/MRI/USG shows:
- Lump
- Thickening
- Enlarged lymph nodes
- Suspicious lesion
Types of EUS
Upper EUS
Scope enters through the mouth.
Used for:
- Esophagus
- Stomach
- Pancreas
- Gallbladder
- Bile duct
Lower EUS
Scope enters through anus.
Used for:
- Rectum
- Colon
- Anal sphincter
- Rectal tumors
How Is the Procedure Performed?
Before Procedure
Usually:
- Fasting for 6–8 hours
-
Certain medicines may need adjustment:
- Blood thinners
- Diabetes medications
- Consent taken
- IV line inserted
For lower EUS:
- Bowel preparation may be required
During the Procedure
Step-by-Step
- Patient lies on left side
- Sedation/anesthesia is given
- Mouth guard placed (for upper EUS)
- Flexible echoendoscope inserted
- Ultrasound images appear on monitor
- Doctor examines organs in detail
- If needed, biopsy/FNA taken using a needle
The procedure generally takes:
- 30–60 minutes
- Longer if biopsy/intervention done
Is EUS Painful?
Usually NO.
Most patients are sedated and:
- Sleep during procedure
- Feel minimal discomfort
- Often remember very little afterward
Some may experience:
- Mild sore throat
- Bloating/gas
- Sleepiness for few hours
These symptoms usually settle within 24 hours.
What is EUS-Guided Biopsy (FNA/FNB)?
Sometimes doctor sees:
- Mass
- Lymph node
- Cyst
- Suspicious lesion
A thin needle is passed through the scope to collect tissue/fluid sample.
This is called:
- FNA → Fine Needle Aspiration
- FNB → Fine Needle Biopsy
It helps confirm:
- Cancer
- Infection
- Inflammation
- Pancreatitis
Advantages of EUS
Very High Accuracy
Especially for:
- Pancreas
- Small tumors
- CBD stones
Detects Very Small Lesions
Sometimes missed on:
- CT scan
- MRI
- Normal ultrasound
Allows Biopsy
Diagnosis and tissue sampling can happen in same sitting.
Minimally Invasive
No external cuts/surgery.
Risks & Complications
EUS is generally very safe, but rare complications include:
- Bleeding
- Infection
- Sedation reaction
- Pancreatitis (rare after pancreatic biopsy)
- Perforation/tear (very rare)
Recovery After EUS
- Observation for 1–2 hours
- Soft diet after recovery
- No driving same day
- Most people return to normal activity next day
When Should You Contact Doctor After EUS?
Immediately seek help if:
- Severe abdominal pain
- Fever
- Vomiting
- Black stools
- Breathing difficulty
- Heavy bleeding
Difference Between EUS and Normal Endoscopy
| EUS | Normal Endoscopy |
|---|---|
| Uses ultrasound + camera | Uses camera only |
| Can see deeper layers and nearby organs | Sees inner lining only |
| Can evaluate pancreas, bile ducts, lymph nodes | Mainly evaluates GI tract lining |
| Allows guided biopsy from deep structures | Biopsy mainly from surface lining |
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