Islands of squamous cells were found scattered in the transitional epithelium and the ciliated epithelium but the appeared time was different.

过渡上皮和纤毛上皮中均散在岛状鳞状上皮但出现时间不一致。

Nests of transitional epithelium grow downward into the lamina propria and a central cystic space forms.

移行上皮向下伸入到固有层并形成囊.