microglandular adenosis

mi·cro·glan·du·lar ad·e·no·sis

adenosis of the breast in which irregular clusters of small tubules are present in adipose or fibrous tissues, resembling tubular carcinoma but lacking stromal fibroblastic proliferation.

microglandular adenosis

A haphazard proliferation of uniform, cytologically bland glands in the breast which presents as a poorly cicumscribed mass. Up to 27% of cases have in situ or invasive cancer at the time of diagnosis; it may evolve to breast carcinoma.
 
DiffDx
Acinic cell carcinoma (breast).

mi·cro·glan·du·lar ad·e·no·sis

(mī'krō-glan'dyū-lăr ad'ĕ-nō'sis) Glandular disease of the breast in which irregular clusters of small tubules are present in adipose or fibrous tissues, resembling tubular carcinoma but lacking stromal fibroblastic proliferation.