title: Band-like interposing fat along large vessels: ultrasonographic pseudolesions of the breast.
abstract: OBJECTIVE
  The aim of this study is to evaluate the clinical characteristics and ultrasonographic findings of band-like interposing fat as well as to identify additional approaches for its diagnosis.
  
  
  METHODS
  This study included 26 confirmed cases of band-like interposing fat from June 2008 to June 2010. A retrospective analysis was performed to evaluate the clinical characteristics and ultrasonographic findings in these cases. Five radiologists analyzed the ultrasonographic findings, which correlated with the mammographic and MRI findings when available, according to Breast Imaging Reporting and Data System classification.
  
  
  RESULTS
  None of the 26 patients had any symptoms. In 92.3% of the patients, the lesion was located in the upper outer quadrant of the breast. The mean distance of the lesion from the nipple was 2.4 ± 0.7 cm (1.1-4.5). The mean depth of the lesion from the skin was 1.3 ± 0.3 cm (0.8-2.1). The mean maximal length of the lesion was 0.8 ± 0.4 cm (0.3-1.8). The following were the most frequent ultrasonographic findings of lesions: irregular shape, not parallel orientation, indistinct margins, abrupt interface, hypoechogenicity, no posterior feature, no calcification, and presence of vascularity. The most frequent BI-RADS category was 4a. There were no suspicious findings on the mammography or MRI.
  
  
  CONCLUSIONS
  Ultrasonographic findings may lead to misclassification of band-like interposing fat as a malignancy. A better understanding of the clinical and ultrasonographic characteristics of band-like interposing fat would facilitate its differentiation from a true mass.
authors.affiliation: Department of Radiology, St. Paul Hospital, The Catholic University of Korea College of Medicine Seoul 130-709, Korea.
authors.forename: Bong Joo
authors.initials: BJ
authors.lastname: Kang
authors.forename: Hyeon Sook
authors.initials: HS
authors.lastname: Kim
authors.forename: Eun Suk
authors.initials: ES
authors.lastname: Cha
authors.forename: Jae Hee
authors.initials: JH
authors.lastname: Lee
authors.forename: Chang Suk
authors.initials: CS
authors.lastname: Park
authors.forename: Na Young
authors.initials: NY
authors.lastname: Jung
authors.forename: In Young
authors.initials: IY
authors.lastname: Whang
authors.forename: Sung Hun
authors.initials: SH
authors.lastname: Kim
authors.forename: Jae Jeong
authors.initials: JJ
authors.lastname: Choi
authors.forename: Ahwon
authors.initials: A
authors.lastname: Lee
mesh_terms: D000273:Adipose Tissue / Q000000981:diagnostic imaging*; D000328:Adult; D044963:Biopsy, Fine-Needle; D001941:Breast Diseases / Q000000981:diagnostic imaging* / Q000473:pathology; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D005260:Female; D006801:Humans; D008323:Mammary Arteries / Q000000981:diagnostic imaging*; D008875:Middle Aged; D011247:Pregnancy; D012189:Retrospective Studies; D016217:Ultrasonography, Mammary / Q000379:methods*; D055815:Young Adult
keywords: Breast mass; Fatty tissue; Ultrasonography
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