Value of screening endoscopy in evaluation of esophageal, gastric and colon cancers

Figure 1 Differences in white light imaging from narrow-band imaging. A: White light imaging (WLI) displays an erythematous area in the posterior wall of the hypopharynx (white arrow); B: Magnifying WLI reveals a minimally erythematous patch with tiny microdots (white arrow): C: Narrow-band imaging (NBI) locates a distinct brown lesion in the posterior wall of the hypopharynx (white arrow); D: Magnifying NBI also demonstrates a distinct brown lesion with microdots that can be distinguished from the healthy mucosa surrounding it (white arrow)[20].