Positive margin post-mastectomy

[qwert]

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What is the most accepted definition of a positive and close margin after total mastectomy for breast Ca?
It is 2 mm in the setting of breast conservation, not sure for post-mastectomy setting.

 

[Palex80]

What is the most accepted definition of a positive and close margin after total mastectomy for breast Ca?
It is 2 mm in the setting of breast conservation, not sure for post-mastectomy setting.

I'd say anything closer than 3mm is close/positive.
That's our institutional guideline at least.