Male Breast 11.1 FLORID-PHASE GYNECOMASTIA VS. ATYPICAL DUCTAL HYPERPLASIA IN GYNECOMASTIA Florid-Phase Gynecomastia Atypical Ductal Hyperplasia (ADH) in Gynecomastia Age Adolescent boys and men in sixth and seventh decade, newborns…

Sentinel Lymph Nodes 9.1 BENIGN TRANSPORT VS. ISOLATED TUMOR CELLS Benign Transport Isolated Tumor Cells (ITC) Age Women of any age who undergo lymph node evaluation as part of breast…

Fibroepithelial Lesions 7.1 FIBROADENOMA VS. HAMARTOMA Fibroadenoma Hamartoma Age Any age, most frequent in women younger than 30 y old, frequently peri- and postpubertal adolescents Any age, usually women in…

Papillary and Sclerosing Lesions 5.1 SCLEROSED PAPILLOMA VS. FIBROADENOMA Sclerosed Papilloma Fibroadenoma Age Adult women Adult women, often bimodal distribution Location Often central, subareolar Any location in breast Imaging findings…

Ductal Carcinoma In Situ 4.1 CRIBRIFORM ATYPICAL DUCTAL HYPERPLASIA VS. LOW-GRADE DUCTAL CARCINOMA IN SITU Cribriform Atypical Ductal Hyperplasia (ADH) Low-Grade Ductal Carcinoma In Situ (DCIS) Age Adult women Adult…

Lobular Neoplasia and Its Distinction from Other Epithelial Proliferative Lesions 3.1 FLORID HYPERPLASIA WITH CLEAR CELLS VS. ATYPICAL LOBULAR HYPERPLASIA Florid Hyperplasia with Clear Cells Atypical Lobular Hyperplasia (ALH) Age…

Epithelial Proliferative Lesions, Usual and Atypical Ductal Hyperplasia 2.1 FLORID HYPERPLASIA VS. CRIBRIFORM-PATTERN ATYPICAL DUCTAL HYPERPLASIA Florid Hyperplasia without Atypia Cribriform-Pattern Atypical Ductal Hyperplasia (ADH) Age Adult women Adult women…

Nonproliferative Alterations of Acini 1.1 COLUMNAR CELL LESION WITHOUT ATYPIA VS. CYSTICALLY DILATED LOBULAR UNIT Columnar Cell Lesion without Atypia Cystically Dilated Lobular Unit Age Adult women Adult women Imaging…