Fig. 3
a The nodular neoplasm was observed in the nasopharyngeal with a rough superficial mucosa, which occupied a large area of the nasopharyngeal cavity. The pharyngeal recess was compressed. b The mucosal superficial vessel morphology was irregular. The white arrow shows the circuitous vessels, and the blue arrow shows the looped vessels. c The white arrow shows the distorted and locally expanded superficial vessels. Pathological diagnosis: undifferentiated and non-keratinizing carcinoma