Mammary mucinous lesions: congeners, prevalence and important pathological associations.

Abstract:

:A retrospective histopathological study was undertaken to determine the prevalence of mucin filled ducts and their associated mucinous proliferation in 962 breast cancers and 335 benign lesions. A total of 38 (3%) cases with mucin filled ducts was identified and 27 (2%) of these showed mucin extravasation into the adjacent stroma, changes characteristic of mucocoele-like lesions. This constitutes the largest series reported to date. Of the mucocoele-like lesions 12 were prototypic screen-detected cases: 11 of which were mammographically detected on account of suspicious microcalcification and eight cases (67%) exhibited mucinous atypical ductal hyperplasia without overt malignancy. A further 12 mucocoele-like lesions were incidental findings in screen-detected (11) and symptomatic (one) cancers, the majority of which were invasive ductal carcinomas of no special type. In six of these cases (50%), mucinous atypical ductal hyperplasia or ductal carcinoma in situ was present. Thirty mucinous carcinomas constituted 3% of all cancers and three cases had associated mucocoele-like lesions. Mucinous atypical ductal hyperplasia or ductal carcinoma in situ was also associated with 11 cases of mucinous carcinoma. In six mucinous carcinomas, amorphous microcalcification with a similar appearance to that of benign mucocoele-like lesions was identified in the mucin, suggesting a possible link between the two lesions. Mucin-filled ducts or mucocoele-like lesions were almost twice as frequent in screen-detected as in symptomatic lesions. The presence of mucinous atypical ductal hyperplasia in screen-detected mucocoele-like lesions, a decade earlier than the peak of mucinous carcinoma, is a possible risk factor for subsequent invasive malignancy. Mucin-filled ducts, mucocoele-like lesions, mucinous atypical ductal hyperplasia or ductal carcinoma in situ and mucinous carcinoma may represent different stages of the same disease process. Our findings suggest that patients with mucin-filled ducts of mucocoele-like lesions merit close follow-up.

journal_name

Histopathology

journal_title

Histopathology

authors

Chinyama CN,Davies JD

doi

10.1046/j.1365-2559.1996.d01-535.x

subject

Has Abstract

pub_date

1996-12-01 00:00:00

pages

533-9

issue

6

eissn

0309-0167

issn

1365-2559

journal_volume

29

pub_type

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