(A) Histiocytes of duct ectasia, where in the absence of an intact duct, the histiocytic population can resemble the tumour cells of histiocytoid breast.

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Ductal carcinoma in situ (DCIS)

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Patterns of ductal carcinoma in situ (DCIS)

Ductal carcinoma in situ (DCIS)

Ductal Carcinoma in Situ of the Breast

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Presentation transcript:

(A) Histiocytes of duct ectasia, where in the absence of an intact duct, the histiocytic population can resemble the tumour cells of histiocytoid breast carcinoma. (A) Histiocytes of duct ectasia, where in the absence of an intact duct, the histiocytic population can resemble the tumour cells of histiocytoid breast carcinoma. Inset shows CK7 decorating the residual epithelium of a duct that is partially effaced by histiocytes. (B) Histiocytes in post-chemotherapy changes, with a duct in the lower field containing pleomorphic cells of residual ductal carcinoma in situ. Puay Hoon Tan et al. J Clin Pathol 2011;64:654-659 Copyright © by the BMJ Publishing Group Ltd & Association of Clinical Pathologists. All rights reserved.