title: Diagnosis of peripheral pulmonary lesions with radial probe endobronchial ultrasound-guided bronchoscopy.
abstract: BACKGROUND
  The diagnosis of peripheral pulmonary lesions (PPLs) is a challenging task for pulmonologists. Radial probe endobronchial ultrasound (R-EBUS) has been developed to enhance diagnostic yield. The objective of this study was to evaluate the effectiveness of R-EBUS in the diagnosis of PPLs.
  
  
  METHODS
  A retrospective study was conducted on 174 patients diagnosed with PPLs who underwent EBUS-guided bronchoscopy. Histological examination of specimens obtained by transbronchial lung biopsy (TBLB) and cytological examinations of brushing smear, brush rinse fluid and bronchoalveolar lavage fluid (BALF) were evaluated for the diagnosis.
  
  
  RESULTS
  The mean diameter of the PPLs was 25.1 ± 10.7 mm. The final diagnoses included 129 malignancies and 45 benign lesions. The overall diagnostic yield of EBUS-guided bronchoscopy was 79.9%. Neither size nor etiology of the PPLs influenced the diagnostic performance of EBUS-guided bronchoscopy (82.9% vs. 74.6% for PPLs>20mm and PPLs≤20mm; p=0.19, and 82.9% vs. 71.1% for malignancy and benign diseases; p=0.09). TBLB rendered the highest yield among these specimens (69.0%, 50.6%, 42.0%, and 44.3% for TBLB, brushing smear, brush rinse fluid, and BALF, respectively; p<0.001). The combination of TBLB, brush smear, and BALF provided the greatest diagnostic yield, while brush rinse fluid did not add benefits to the outcomes.
  
  
  CONCLUSIONS
  R-EBUS-guided bronchoscopy is a useful technique in the diagnosis of PPLs. To achieve the highest diagnostic performance, TBLB, brushing smear and bronchoalveolar lavage should be performed together.
authors.affiliation: Division of Pulmonary and Critical Care Medicine, Department of Medicine, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Tailandia. Electronic address: bss-vb@hotmail.com.
authors.forename: Viboon
authors.initials: V
authors.lastname: Boonsarngsuk
authors.affiliation: Department of Pathology, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Tailandia.
authors.forename: Wasana
authors.initials: W
authors.lastname: Kanoksil
authors.affiliation: Division of Pulmonary and Critical Care Medicine, Department of Medicine, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Tailandia.
authors.forename: Sarangrat
authors.initials: S
authors.lastname: Laungdamerongchai
mesh_terms: D001706:Biopsy; D001999:Bronchoscopy / Q000379:methods*; D019160:Endosonography; D005260:Female; D006801:Humans; D008171:Lung Diseases / Q000000981:diagnostic imaging / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies
keywords: Broncoscopia flexible; Diagnostic yield; Ecografía endobronquial; Endobronchial ultrasound; Flexible bronchoscopy; Fluoroscopia; Fluoroscopy; Lesiones pulmonares periféricas; Peripheral pulmonary lesions; Rendimiento diagnóstico