title: Surgical treatment of intracystic carcinoma of the breast.
abstract: BACKGROUND
  Intracystic carcinoma of the breast is a type of breast cancer with favorable prognosis where cancer arises from the cystic wall. However, it is a relatively rare disease, and no general consensus has been reached on its definition, including pathogenesis, extramural invasion, and lymph node metastasis.
  
  
  METHODS
  Six patients who underwent surgery at the Department of Surgery at Asahikawa Medical University are presented. In each patient, background factors, diagnosis, surgery, pathological diagnosis, and prognosis were investigated.
  
  
  RESULTS
  Fine needle aspiration showed class V disease in three patients and class III disease in the other three, and lumpectomy was performed for class III patients. Three patients underwent breast-conserving surgery While extramural invasion was seen in three patients, lymph node metastasis was absent in all patients.
  
  
  CONCLUSIONS
  When it is difficult to diagnose intracystic carcinoma of the breast by fine needle aspiration, active lumpectomy is necessary. Because extramural invasion and lymph node metastasis have been reported, it is necessary to carefully determine the range of excision and rationally perform lymph node dissection, such as sentinel node biopsy.
authors.affiliation: Department of Surgery, Asahikawa Medical University, Asahikawa, Hokkaido, Japan. k1111@asahikawa-med.ac.jp
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kitada
authors.forename: Satoshi
authors.initials: S
authors.lastname: Hayashi
authors.forename: Yoshinari
authors.initials: Y
authors.lastname: Matsuda
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Sato
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Miyokawa
authors.forename: Tadahiro
authors.initials: T
authors.lastname: Sasajima
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001943:Breast Neoplasms / Q000473:pathology / Q000601:surgery*; D018270:Carcinoma, Ductal, Breast / Q000473:pathology / Q000601:surgery*; D002285:Carcinoma, Intraductal, Noninfiltrating / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D008198:Lymph Nodes / Q000473:pathology / Q000601:surgery*; D008875:Middle Aged; D009367:Neoplasm Staging; D016896:Treatment Outcome