病变早期为小结节状，晚期形成侵蚀性溃疡，病程缓慢，很少转移。

Its shape changes from small nodule in the early stage to erosive ulcer in the later.

youdao

病变早期为小结节状，晚期形成侵蚀性溃疡，病程缓慢，很少转移。

Its shape changes from small nodule in the early stage to erosive ulcer in the later.

youdao