DCIS of the breast is characterized by two patterns of stromal microvessels. The first pattern is a diffuse increase in stromal microvessels surrounding involved spaces. This pattern is particularly prominent in comedo-type lesions with marked stromal desmoplasia. The second pattern is microvessel cuffing of involved spaces that is present in only a minority of cases and appears unrelated to histologic features evaluated, including DCIS subtype.
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