Overview
EUS combines endoscopy and ultrasound to visualize gastrointestinal wall layers and adjacent structures with the ability to perform fine needle aspiration.
Technique
Radial and linear echoendoscopes provide different views. FNA and FNB enable tissue diagnosis under direct ultrasound guidance.
Clinical Uses
Pancreatic mass evaluation staging of GI cancers and drainage of fluid collections.
Limitations and Safety
Invasive procedure with sedation risks. Requires endoscopic and sonographic expertise.