In this video we can see the vascular pattern of the vocal folds in a patient who has benign polyp. The narrow band imaging (NBI) technique was used. The visibility of capillaries, veins and other subtle tissue structures was improved by the optical filter technology. Narrow band blue light (415nm) is displaying superficial capillary networks which appear brown, while green light (540nm) is displaying subepithelial vessels [vein] which appear cyan in colour. Some typical lesions well seen by this technique of endoscopic imaging are mucosal inflammation, vascular ectasia and varices, and neo-vascularisation by tumour.
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