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Because there are so many different oppinions for this case, immunostains are needed.
Differential diagnoses include
Benign papilloma,
Atypical papilloma,
Papillary DCIS (introductal papillary carcinoma),
ecapsulated papillary carcinoma.
If it is papilloma, it should be atypical papilloma at least.
It may be encapsulated papillary carcinoma.