I am more generous to report squamous differentiation...There is clearly threshold and individual experience. I would report invasive urothelial carcinoma with squamous differentiation.  The argument to report "squamous" (if it is true) is to provide useful information when evaluating of any nodal and distant metastasis.

 invasive high grade urothelial carcinoma

Clear-cut squamous differentiation is not seen here.

  浸润性尿路上皮癌，不太考虑鳞癌。

 浸润性尿路上皮癌，不太考虑鳞癌。

 I favor 报浸润性尿路上皮癌. 尿路上皮癌伴鳞化 has to show 1) keratin-pearl formation, and/or 2) intercellualr bridges, and/or 3) keratotic cellular debris.  If there is squamous differentiation (even it is very little), my report will be worded as "urothelial carcinoma, high grade, with squamous differentiation (x%).

 请问各位老师：报浸润性尿路上皮癌？还是浸润性尿路上皮癌伴鳞化？鳞癌成分占多少才报呢？

    浸润性高级别尿路上皮癌伴鳞癌分化

 浸润性高级别尿路上皮癌伴鳞癌分化

 浸润性尿路上皮癌。

 膀胱可以发生鳞状细胞癌的，但需与尿路上皮癌伴鳞化区别。