title: Internal mammary lymph nodes as incidental findings at screening breast MRI.
abstract: OBJECTIVE
  To evaluate the prevalence of internal mammary lymph nodes (IMLNs) on breast magnetic resonance imaging (MRI) in a screening population.
  
  
  METHODS
  We retrospectively reviewed 92 consecutive screening breast MRI exams. Logistic regression was performed to ascertain the risk of IMLNs in cancer-free subjects and to determine whether the risk varies with age.
  
  
  RESULTS
  IMLNs were present in 48.9% of patients. Mean node size was 4 mm (range, 3-10 mm). The prevalence of IMLNs was not related to age. No patients developed breast cancer after a mean follow-up of 3 years.
  
  
  CONCLUSIONS
  Subcentimeter IMLNs are common incidental findings at screening breast MRI.
authors.affiliation: University of California, San Francisco, Department of Radiology and Biomedical Imaging, 1600 Divisadero St., Room C250, Mail Box 1667, San Francisco, CA 94115. Electronic address: kimberly.ray@ucsf.edu.
authors.forename: Kimberly M
authors.initials: KM
authors.lastname: Ray
authors.affiliation: Hill Medical Corporation, 625 S. Fair Oaks Avenue, Suite 140, Pasadena, CA 91106. Electronic address: reemamunir@gmail.com.
authors.forename: Reema
authors.initials: R
authors.lastname: Munir
authors.affiliation: Kaiser Vallejo Medical Center, 975 Sereno Drive, Vallejo CA, 94589. Electronic address: djwisner@gmail.com.
authors.forename: Dorota J
authors.initials: DJ
authors.lastname: Wisner
authors.affiliation: Kaiser San Francisco Medical Center, Department of Radiology, San Francisco, CA. Electronic address: anechco@gmail.com.
authors.forename: Ania
authors.initials: A
authors.lastname: Azziz
authors.affiliation: Kaiser Permanente Northwest, 10180 Southeast Sunnyside Road, Clackamas, OR 97015. Electronic address: bel.chang@gmail.com.
authors.forename: Belinda Chang
authors.initials: BC
authors.lastname: Holland
authors.affiliation: University of California, San Francisco, Department of Epidemiology and Biostatistics, Mission Hall: Global Health & Clinical Sciences Building, 550 16th St, 2nd floor, Box #0560, San Francisco, CA 94158-2549. Electronic address: john.kornak@ucsf.edu.
authors.forename: John
authors.initials: J
authors.lastname: Kornak
authors.affiliation: University of California, San Francisco, Department of Radiology and Biomedical Imaging, 1600 Divisadero St., Room C250, Mail Box 1667, San Francisco, CA 94115. Electronic address: bonnie.joe@ucsf.edu.
authors.forename: Bonnie N
authors.initials: BN
authors.lastname: Joe
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000473:pathology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D033162:Incidental Findings; D008198:Lymph Nodes / Q000473:pathology*; D008207:Lymphatic Metastasis; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D015995:Prevalence; D012189:Retrospective Studies
keywords: Breast MRI; Internal mammary lymph nodes