如果混有少量浸润性微乳头状癌成分，如何写诊断？

Pure 浸润性微乳头状癌 is also an uncommon tumor. It oftenis admixed with IDC, NOS.

浸润性微乳头状癌is easy to have axillary lymph node metastasis with a relative poor prognosis.

In above case, you can dx as invasive ductal ca with focal (you can give a % if you know) cribriform pattern. In the comment: you can mention focal tumor show micropapillary pattern.

Generally if focal invasive micropapillary ca is asmixed with invasieve ductal ca, NOS, you can write the dx invasive ductal ca with focal invasive micropapillary ca. Because treatments are no much different (IDC vs IDC with focal micropapillary ca), it is fine if you just call IDC.

 两者生物学行为有差别吗？

Compared with invasive ductal ca, NOS, most cases of pure invasive cribriform carcinoma are well differentiated ca, have a low histologic grade, and have favorable prognosis. Generally the tumors are positive for ER/PR and negative for Her2/neu.

tubular ca, mucinous ca, cribriform ca, medullary ca (rare for dx) are considered ca with favoable prognosis.

 与浸润性导管癌筛状型怎么区别？

same concept.

Invasive ductal carcinoma, cribriform pattern=invasive cribriform ca.

Invasive ca includes invasive ca, NOS and some other subtype, such as invasive cribriform ca, apocrine ca, mucinous ca.....

 如果全片大部分图像如前几幅表现，可诊断浸润性筛状癌吗？

If all have the same morphology as first 4 photos, you can call 浸润性筛状癌.

No clear cut line for the % (like tubular ca). Some people mention >90%show cribriform pattern, then call 浸润性筛状癌.

Remember that  浸润性筛状癌 is just a sub-type of invasive ductal ca. If most areas but not all show cribriform pattern, just diagnosed as IDC with focal cribriform pattern.