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EUS-guided, fine-needle aspiration biopsy using a new mechanical scanning puncture echoendoscope
K F Binmoeller1, B Brand, R Thul
1University Hospital Eppendorf, Department of Endoscopic Surgery, Hamburg, Germany.
Gastrointestinal Endoscopy
|June 3, 1998
Summary
A new mechanical echoendoscope enables feasible, safe, and accurate endoscopic ultrasound-guided fine-needle aspiration biopsy (EUS-FNAB). Improvements in needle visibility are needed, especially for transduodenal procedures.
Area of Science:
- Gastroenterology
- Endoscopic Ultrasound (EUS)
- Interventional Endoscopy
Background:
- A novel mechanical sector scanning echoendoscope was developed for EUS-guided fine-needle aspiration biopsy (FNAB).
- Prospective evaluation focused on technical feasibility, safety, and diagnostic yield.
Purpose of the Study:
- To assess the efficacy and safety of a new mechanical echoendoscope for EUS-guided FNAB.
- To report histocytologic results obtained with the new device.
Main Methods:
- 106 FNAB procedures were performed on 86 patients using the new echoendoscope with a 2.8 mm channel and elevator.
- Target sites included pancreas (58), lymph nodes (43), and miscellaneous lesions (5).
- A 0.7 mm needle was used for punctures; specimens were analyzed for cytology and histology, with definitive diagnosis via surgery or follow-up.
Main Results:
- The wide scanning field facilitated sonographic orientation.
- Good longitudinal needle visibility was achieved in 93% (transesophageal) and 71% (transgastric) but was limited in transduodenal procedures.
- Diagnostic accuracy was 97% (excluding inadequate specimens), with 88.5% sensitivity and 100% specificity for malignancy. Needle penetration challenges occurred in two patients.
Conclusions:
- EUS-guided FNAB is feasible, safe, and accurate with the new mechanical echoendoscope.
- Enhancements in needle visibility are required, particularly for transduodenal approaches.