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Mucinous breast lesions - diagnostic challenges
  1. Puay Hoon Tan (gpttph{at}sgh.com.sg)
  1. Singapore General Hospital, Singapore
    1. Gary MK Tse (gmktse{at}gmail.com)
    1. Chinese University of Hong Kong, Singapore
      1. Boon Huat Bay (antbaybh{at}nus.edu.sg)
      1. National University of Singapore, Singapore

        Abstract

        Breast lesions with mucin represent a broad spectrum of entities, ranging from benign fibrocystic changes with luminal mucin, to mucocele-like lesions (MLL) which can be associated with banal epithelial alterations, atypical ductal hyperplasia, or ductal carcinoma in situ. Occasionally invasive mucinous carcinoma can be identified in contiguity with MLL. Diagnostic challenges are enumerated, histologic differentials are discussed, and a practical approach towards resolving some of these issues is provided. In addition to these lesions with abundant extracellular mucin, there are also conditions that feature stromal mucinous or myxoid material, as well as rare entities that demonstrate both epithelial extracellular and stromal mucin.

        • atypical ductal hyperplasia
        • ductal carcinoma in situ
        • mucinous carcinoma
        • mucocoele-like lesion

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