Fig. 2From: A study on the value of narrow-band imaging (NBI) for the general investigation of a high-risk population of nasopharyngeal carcinoma (NPC)a Smooth nasopharyngeal mucosa was found under the WL mode, and each anatomical sign was clear. b The mucosa-associated lymphoid tissue under the NBI mode was even, and no abnormal proliferating superficial vessels were found. c No clustered vessel growth was observed in the local mucosa under the NBI modeBack to article page