title: The Evaluation of FDG PET/CT Scan Findings in Patients with Organizing Pneumonia Mimicking Lung Cancer.
abstract: OBJECTIVE
  Organizing pneumonia (OP) is a rare lung condition that is characterized by the presence of polypoid tissues due to fibroblastic plugs within respiratory bronchioles, alveolar ducts and sacs. The three main radiologic patterns of OP include typical, solitary-focal and infiltrative forms. The maximum standardized uptake value (SUVmax) on positron emission tomography-computed tomography (PET/CT) may be high in benign conditions such as OP as well as malignant diseases. The aim of our study was to investigate PET-CT characteristics of OP in patients mimicking lung cancer.
  
  
  METHODS
  The clinical and radiologic characteristics of 50 patients who were referred to our hospital for PET/CT evaluation due to suspicion of lung malignancy, and who were pathologically diagnosed as OP between 2009 and 2013 were retrospectively reviewed.
  
  
  RESULTS
  The mean age of the patients was 58.2 years. Ninety-six percent of patients (48) were male. Radiologic evaluation revealed 27 (54%) focal involvement, 10 (20%) consolidation with air-bronchogram (typical), 1 (2%) infiltrative and 12 (24%) other types of involvement (multiple nodules and cavitary lesions). The mean SUVmax value of the lesions on PET/CT was calculated as 6.5. Mediastinal lymph node involvement (at least one station) was detected in 76% of our study group with a mean SUVmax value of 3.27.
  
  
  CONCLUSIONS
  OP may cause false positive results on PET/CT. However, PET/CT results may be used as a guide for invasive procedures that should be performed when there is suspicion of malignancy.
authors: Yurdanur
authors: Y
authors: Erdoğan
authors: Berna Akıncı
authors: BA
authors: Özyürek
authors: Özlem
authors: Ö
authors: Özmen
authors: Nilgün
authors: N
authors: Yılmaz Demirci
authors: Beypazarı State Hospital, Clinic of Pulmonology, Ankara, Turkey Phone: +90 505 297 53 27 E-mail: drsezgisahin@gmail.com.
authors: Sezgi Şahin
authors: SŞ
authors: Duyar
authors: Yeliz
authors: Y
authors: Dadalı
authors: Funda
authors: F
authors: Demirağ
authors: Jale
authors: J
authors: Karakaya