title: Sonography of Invasive Apocrine Carcinoma of the Breast in Five Cases.
abstract: OBJECTIVE
  To evaluate the sonographic features of invasive apocrine carcinoma (IAC) of the breast.
  
  
  METHODS
  This study included five pathologically proven cases of IAC, and their sonographic features were retrospectively analyzed according to the Breast Imaging Reporting and Data System (BI-RADS) lexicon.
  
  
  RESULTS
  All five lesions involved the left breast and were seen as irregularly shaped masses. All lesions, except one, had a parallel orientation to the chest wall. All five lesions showed noncircumscribed margins and heterogeneous echotexture; however, they showed various posterior features. One lesion had edema as an associated feature. Sonographic assessments were classified as BI-RADS category 4 in all five cases.
  
  
  CONCLUSIONS
  Invasive apocrine carcinoma sonographic findings are difficult to differentiate from those of invasive ductal carcinoma of no special type.
authors.affiliation: Department of Hospital Pathology, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: Kyung-Jin
authors.initials: KJ
authors.lastname: Seo
authors.affiliation: Department of Radiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: Yeong Yi
authors.initials: YY
authors.lastname: An
authors.affiliation: Department of Radiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: In Yong
authors.initials: IY
authors.lastname: Whang
authors.affiliation: Department of Hospital Pathology, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: Eun Deok
authors.initials: ED
authors.lastname: Chang
authors.affiliation: Department of Radiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: Bong Joo
authors.initials: BJ
authors.lastname: Kang
authors.affiliation: Department of Radiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: Sung Hun
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Department of Radiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: Chang Suk
authors.initials: CS
authors.lastname: Park
authors.affiliation: Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: Jeong Soo
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Department of Radiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: Hyunjoo
authors.initials: H
authors.lastname: Hong
mesh_terms: D000368:Aged; D001050:Apocrine Glands / Q000000981:diagnostic imaging / Q000473:pathology; D001943:Breast Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D002277:Carcinoma / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D005260:Female; D006801:Humans; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D049268:Positron-Emission Tomography; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000378:metabolism; D011960:Receptors, Estrogen / Q000378:metabolism; D011980:Receptors, Progesterone / Q000378:metabolism; D014057:Tomography, X-Ray Computed; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism; D014463:Ultrasonography
chemical_list: D018719:Erb-b2 Receptor Tyrosine Kinases; D011960:Receptors, Estrogen; D011980:Receptors, Progesterone; D016159:Tumor Suppressor Protein p53; C495901:TP53 protein, human
keywords: Breast; Invasive apocrine carcinoma; Sonography