title: Simple pulmonary eosinophilia found on follow-up computed tomography of oncologic patients.
abstract: OBJECTIVE
  To investigate the prevalence of simple pulmonary eosinophilia (SPE) and validate CT findings of SPE found on follow-up CT of oncologic patients.
  
  
  METHODS
  We retrospectively reviewed 6977 cases of oncologic patients who underwent chest CT. A total of 66 individuals who met criteria for having SPE were identified. CT scans were fully re-assessed by consensus of 2 radiologists in terms of characteristics of pulmonary lesions.
  
  
  RESULTS
  The prevalence of SPE was 0.95%. A total of 193 lesions were identified and most of the lesions showed part-solid pattern (69.9%), round to ovoid contour (46.1%), ill-defined margin (90.2%), or partial halo appearance (74.8%). In addition, almost half of the lesions showed the vascular contact (49%). SPE appeared as either solitary (42.4%) or multiple lesions (57.6%). The majority of lesions were located in the periphery (76.2%), and lower lung zonal (67.4%) predominance was found.
  
  
  CONCLUSIONS
  The frequency of SPE in oncologic patients with CT findings of GGO, part-solid lesion was high (17.5%). Therefore, when key features of CT findings suggesting SPE (part-solid nodule; ill-defined margin; peripheral distribution; and lower lung zone predominance) are newly discovered on follow-up chest CT in oncologic patients, it would be useful to correlate with blood test and do short-term follow-up in order to avoid unnecessary invasive procedure.
authors.affiliation: Department of Radiology, Ajou University School of Medicine, Suwon, Republic of Korea.
authors.forename: Sung Jung
authors.initials: SJ
authors.lastname: Kim
authors.affiliation: Department of Radiology, B&B Hospital, Lalitpur, Nepal.
authors.forename: Anjali Basnyat
authors.initials: AB
authors.lastname: Bista
authors.affiliation: Department of Radiology, Ajou University School of Medicine, Suwon, Republic of Korea.
authors.forename: Kyung Joo
authors.initials: KJ
authors.lastname: Park
authors.affiliation: Department of Radiology, Ajou University School of Medicine, Suwon, Republic of Korea.
authors.forename: Doo Kyoung
authors.initials: DK
authors.lastname: Kang
authors.affiliation: Department of Pulmonology and Critical Care Medicine, Ajou University School of Medicine, Suwon, Republic of Korea.
authors.forename: Joo Hun
authors.initials: JH
authors.lastname: Park
authors.affiliation: Department of Pulmonology and Critical Care Medicine, Ajou University School of Medicine, Suwon, Republic of Korea.
authors.forename: Kwang Joo
authors.initials: KJ
authors.lastname: Park
authors.affiliation: Department of Radiology, Ajou University School of Medicine, Suwon, Republic of Korea. Electronic address: sunnahn@ajou.ac.kr.
authors.forename: Joo Sung
authors.initials: JS
authors.lastname: Sun
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000150:complications*; D015995:Prevalence; D011657:Pulmonary Eosinophilia / Q000000981:diagnostic imaging* / Q000453:epidemiology; D013902:Radiography, Thoracic; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods*
keywords: Computed tomography; Eosinophilia; Lung; Pulmonary eosinophilia; Pulmonary nodule