Advances in endoscopic visualization of colorectal polyps

Area of Science:

• Gastroenterology
• Endoscopic Technology
• Colorectal Cancer Screening

Background:

• Conventional white-light endoscopy is the standard for polyp detection but misses up to 20% of lesions, particularly flat or small ones.
• Early and accurate detection of colorectal polyps is crucial for preventing colorectal cancer.

Purpose of the Study:

• To review the literature on novel endoscopic visualization technologies for improved colorectal polyp detection.
• To assess the efficacy of advanced imaging modalities compared to conventional endoscopy.

Main Methods:

• Literature search of PubMed using terms for various advanced endoscopic techniques (chromoendoscopy, NBI, AFI, FICE, i-Scan, zoom, CLE).
• Focused on systematic reviews, national guidelines, and randomized controlled trials.
• Methodological quality assessed using QUADAS; prospective studies and reference lists were also reviewed.

Main Results:

• Chromoendoscopy and Narrow-Band Imaging (NBI) increase neoplastic polyp detection rates.
• NBI enhances vascular patterns, aiding differentiation of lesions without dyes.
• FICE, AFI, i-Scan improve tissue contrast; CLE offers high-resolution imaging for surveillance and biopsy reduction.

Conclusions:

• Emerging endoscopic technologies demonstrate superiority over conventional methods for polyp detection.
• Further large-scale randomized controlled trials are needed to compare these modalities across patient groups and establish guidelines.