These two images were published and described as “premalignant papillomas” of the skin of a transgenic mouse!
What is your diagnosis?

- Gross image of “premalignant papilloma”.Microscopic image of “premalignant papilloma”

Microscopic image of "premalignant papilloma"
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I think that these are normal nipples with a lactiferous duct running down the middle of the nipple.