title: Intrapulmonary lymph nodes: thin-section CT features of 19 nodules.
abstract: OBJECTIVE
  The purpose of this study was to describe the thin-section CT features of intrapulmonary lymph nodes that accompanied primary or metastatic lung tumors.
  
  
  METHODS
  A retrospective analysis of thin-section CT features was performed on 19 nodules in 16 patients with pathologically confirmed intrapulmonary lymph nodes that accompanied primary or metastatic lung tumors.
  
  
  RESULTS
  Of the 16 patients, 13 had a solitary nodule and 3 had two nodules. All nodules were distributed in the middle lobe, lingula, or lower lobe. On thin-section CT images, the nodule was located abutting the visceral pleura (n = 10) or within 8 mm of the visceral pleura (n = 9). The thin-section CT findings showed that most of the nodules were well circumscribed (n = 18), homogeneous (n = 19), ovoid (n = 10), or round (n = 9) and smaller than 12 mm in maximal diameter. The surrounding lung field was normal (n = 16).
  
  
  CONCLUSIONS
  Intrapulmonary lymph nodes are subpleural in the lower lung field. On thin-section CT, they are well circumscribed, homogeneous, round or ovoid, and smaller than 12 mm in maximal diameter. In the differential diagnosis of subpleural nodules located in the lower lung field, it should be kept in mind that they may be intrapulmonary lymph nodes even though the patient has malignancy.
authors.affiliation: Department of Radiology, University of Ryukyu School fo Medicine, Okinawa Prefecture, Japan. Oshiro4211@aol.com
authors.forename: Yasuji
authors.initials: Y
authors.lastname: Oshiro
authors.forename: Masahiko
authors.initials: M
authors.lastname: Kusumoto
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Moriyama
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kaneko
authors.forename: Kenji
authors.initials: K
authors.lastname: Suzuki
authors.forename: Hisao
authors.initials: H
authors.lastname: Asamura
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Kondo
authors.forename: Ryousuke
authors.initials: R
authors.lastname: Tsuchiya
authors.forename: Sadayuki
authors.initials: S
authors.lastname: Murayama
mesh_terms: D000368:Aged; D003110:Colonic Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging / Q000473:pathology; D008175:Lung Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000556:secondary*; D008198:Lymph Nodes / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D010994:Pleura / Q000000981:diagnostic imaging / Q000473:pathology; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed