When to puncture, when not to puncture: Submucosal tumors

Area of Science:

• Gastroenterology
• Endoscopy
• Oncology

Background:

• Subepithelial masses in the gastrointestinal (GI) tract are common and often require evaluation.
• These lesions typically present as mucosal protuberances.
• Accurate diagnosis is crucial for patient management.

Purpose of the Study:

• To review the diagnostic efficacy of endoscopic ultrasound (EUS)-guided fine-needle aspiration (FNA) for subepithelial GI lesions.
• To discuss technical considerations and alternative methods for tissue acquisition.
• To highlight areas of controversy and future research needs.

Main Methods:

• Review of existing literature on EUS-FNA for subepithelial GI lesions.
• Discussion of technical factors influencing FNA performance, including needle choice, technique, and on-site pathology.
• Comparison of FNA with alternative methods like bite-on-bite sampling and endoscopic submucosal resection (ESMR).

Main Results:

• EUS-guided FNA is considered superior for tissue sampling of subepithelial lesions.
• Technical factors such as needle type, size, and use of suction/stylet impact diagnostic yield.
• ESMR demonstrated a significantly higher diagnostic yield compared to bite-on-bite sampling.
• Complication rates for EUS-FNA are generally low, but incidence and severity are not fully established.

Conclusions:

• EUS-guided FNA is the primary modality for investigating subepithelial GI masses.
• Optimizing technical aspects and considering on-site cytopathology can enhance diagnostic accuracy.
• Further prospective trials are necessary to establish optimal EUS-FNA techniques and fully understand complication profiles.