Endoscopic Ultrasound-Guided Tissue Acquisition: Techniques and Challenges

Area of Science:

• Gastroenterology
• Oncology
• Pathology

Background:

• Endoscopic ultrasound-guided fine needle aspiration (EUS FNA) is a valuable tool for diagnosing pancreatic neoplasms, lymph node diseases, gastrointestinal submucosal lesions, and other masses.
• EUS FNA involves careful patient selection, appropriate needle choice (25, 22, or 19-gauge), and evidence-based tissue sampling techniques.

Purpose of the Study:

• To review the diagnostic utility and limitations of EUS FNA.
• To introduce endoscopic ultrasound-guided fine needle biopsy (EUS FNB) as a novel technique for tissue acquisition.

Main Methods:

• Review of current literature on EUS FNA procedures and diagnostic capabilities.
• Discussion of limitations including the need for onsite cytopathologists, reliance on histology, and challenges with molecular marker assessment.
• Introduction of EUS-guided fine needle biopsy (FNB) as an alternative sampling method.

Main Results:

• EUS FNA simplifies pathological diagnosis for a range of conditions.
• Key limitations of EUS FNA include the need for cytopathologist presence and difficulties in molecular marker assessment.
• EUS-guided FNB offers core tissue sampling, with initial results being promising but requiring further validation.

Conclusions:

• EUS FNA is an established, effective diagnostic procedure with recognized limitations.
• EUS-guided FNB represents a promising advancement, though more extensive research is needed to confirm its superiority and guide widespread adoption.
• Future research should focus on comparative studies to establish the definitive role of EUS FNB in clinical practice.