High risk lesions:

• Atypical ductal hyperplasia (ADH)

• Atypical lobular hyperplasia (ALH)

• Lobular carcinoma in-situ (LCIS)

• Flat epithelial atypia (FEA)

• Just fills lobule. 

• Share features with LCIS but lesser in extent. similar to relationships of ADH and DCIS in that it is an atypical precursor to the in situ disease but differs in extent of involvement. 

• ALH has generalized risk