Atypical Lobular Hyperplasia (ALH)

Epidemiology:

Common sites:

Gross features:

Histologic features:

• proliferation of cells identical to those of LCIS except:
• cells do not fill and distend more than 50% of the acini within a lobule
• extension into ducts is associated with an increased risk of developing invasive carcinoma

Immunophenotype:

Marker:

Sensitivity:

Specificity:

Molecular features:

Other features: