title: Ectopic breast tissue in axillary lymph node.
abstract: Benign epithelial inclusions are uncommonly found in lymph nodes, and ectopic breast tissue in axillary lymph nodes is particularly uncommon. The patient is a 48-year-old woman who had an adenoma of the nipple removed 10 years previously. A swollen lymph node with amorphous calcifications in a clustered distribution on mammogram was found in the left axilla. Fine needle aspiration cytology showed only cystic change. Excisional biopsy was performed and microscopic examination demonstrated that the node contained benign mammary epithelial and glandular inclusions, and no evidence of malignancy. Such cases will be increasingly found due to the widespread use of mammography screening and biopsy of axillary sentinel lymph nodes. Ectopic breast tissue in lymph nodes may be mistaken for malignant lesions. It is most important to identify correctly the epithelial inclusions in lymph nodes to prevent an erroneous diagnosis.
authors.affiliation: Department of General Surgery, Chiba University Graduate School of Medicine, Chiba, 260-0856, Japan.
authors.forename: Masami
authors.initials: M
authors.lastname: Kadowaki
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nagashima
authors.forename: Hiroto
authors.initials: H
authors.lastname: Sakata
authors.forename: Masahiro
authors.initials: M
authors.lastname: Sakakibara
authors.forename: Takafumi
authors.initials: T
authors.lastname: Sangai
authors.forename: Rikiya
authors.initials: R
authors.lastname: Nakamura
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Fujimoto
authors.forename: Manabu
authors.initials: M
authors.lastname: Arai
authors.forename: Yasuhide
authors.initials: Y
authors.lastname: Onai
authors.forename: Yuichirou
authors.initials: Y
authors.lastname: Nagai
authors.forename: Yukimasa
authors.initials: Y
authors.lastname: Miyazawa
authors.forename: Masaru
authors.initials: M
authors.lastname: Miyazaki
mesh_terms: D044963:Biopsy, Fine-Needle; D001940:Breast; D002828:Choristoma / Q000473:pathology*; D005260:Female; D006801:Humans; D008198:Lymph Nodes / Q000473:pathology*; D008206:Lymphatic Diseases / Q000473:pathology*; D008875:Middle Aged; D021701:Sentinel Lymph Node Biopsy