The benign tumors included 38 nevi, 15 squamous papillomas, 13 cysts, 11 verrucae, 10 seborrheic keratoses, four hemangiomas, and others.

• 于手术前在恶性肿瘤病例中有2例被临床诊断为良性肿瘤，有2例被诊断成他种恶性肿瘤。