Ductal Carcinoma In Situ of the Breast: A Surgical Perspective

Table 1

Classification of Tavassoli [18].

Proposed classification	Current designation	Necrosis	Excised margin
DIN 1a	IDH	None	Negative
	AIDH, flat monomorphic	−	? Negative
	DCIS, grade 1 (crib/micropap)	−	Positive
DIN 1b	DCIS, grade 2	+	Positive
	(crib/micropap + necrosis or atypia)	+
	Special type—specify
DIN 3b	DCIS Grade 3	+++	Positive
	(Anaplastic DCIS)	±