The growth is primarily exophytic (outward into the lumen) and invasion is not seen at this point.生长最初是外生性的（朝向腔内），不见浸润。
This irregular reddish, ulcerated exophytic mid-esophageal mass as seen on the mucosal surface is a squamous cell carcin不规则微红色外生性溃疡，位于食管中段粘膜表面的的肿块是鳞状细胞癌。
This panoramic low power iew shows how inerted papillomas can often create an exophytic mass.断层面在低倍镜下可清楚显示内翻性乳头状瘤是如何形成外生性肿块的。