Endoscopic features of oral and pharyngolaryngeal papillomas and their role in distinguishing squamous cell carcinoma

Figure 3 Typical endoscopic images of oral and pharyngolaryngeal squamous cell carcinomas with elevated morphology. A-C: Typical endoscopic images; D and E: The schema. A and D: In a squamous cell carcinoma lesion, an uneven, lobulated structure and irregular morphology of capillaries are observed (arrow); B and E: Coexistence of a flat lesion is evident within a squamous cell carcinoma (arrows). The lobulated structure is absent, and the morphology of the capillaries is irregular in the flat lesion; C: Another squamous cell carcinoma accompanies a flat lesion without a lobulated structure (arrows).