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

Figure 4 Positivity rates of findings for diagnosing squamous cell carcinoma and papillomas in donut plots. A: Lesions were diagnosed as squamous cell carcinoma when at least one of the following three characteristics was present: (1) Uneven or absent lobulated structure; (2) Irregular morphology of capillaries; or (3) Coexistence of flat lesions. Lesions without any of these characteristics were diagnosed as papillomas. The sensitivity and specificity of squamous cell carcinoma diagnosis by evaluator Hamada K were 100% and 68.9%, respectively; B: For evaluator Kono Y, the sensitivity and specificity were 976% and 93.3%, respectively. SCC: Squamous cell carcinoma.