US-guided core biopsy pathology report:

Richly vascularised lesion, 4mm across, circumscribed edges. Variably sized crowded capillary vessels and cavernous vascular spaces are seen, in part with intraluminal RBCs and occasional mononuclear leucocytes. The intervening stroma is minimally edematous and fibrous. There is no solid endothelial proliferation, necrosis or pseudopapillary hyperplasia. 

There is no complex infiltrative pattern, cytological atypia or mitotic activity.

Comment:

The sharp circumscription and lack of atypical features favours a benign haemangioma. 

The possibility of angiosarcoma should be considered with any vascular lesion of the breast, requiring clinical and radiological correlation.

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