Interesting case.

There are different classification of papillary lesions.

generally papillary lesions include intraductal papilloma (bengin), atypical papilloma, DCIS arising from papilloma, papillary carcinoma (papillary DCIS). The key is myoepithelial. If you are not sure it is benign or atypical or malignant, do myoepithelial stains. If myoepithelial cells are totally lost within the papillary lesion, it is  papillary carcinoma.

For above case, I feel the myoepithelial layer are present. Any way I will do myoepithelial stains if I am not sure.

 谢谢姜老师指点，刚才查资料，见到一个综述，挺好的，看完基本明白了。连接如下：

http://arpa.allenpress.com/arpaonline/?request=get-document&doi=10.1043%2F1543-2165-133.6.893

 低级别乳头状导管上皮内瘤(low-grade papillary ductal intraepithelial neoplasia)，泡状核；

文献已经有报道“高柱状细胞甲状腺乳头状癌样乳腺肿瘤”。