PT - JOURNAL ARTICLE AU - Mariko Okamoto AU - Noriaki Kurimoto AU - Masamichi Mineshita AU - Teruomi Miyazawa TI - Diagnostic accuracy of endobronchial ultrasonography using a guide sheath for peripheral lung cancer with ground-glass opacity DP - 2013 Sep 01 TA - European Respiratory Journal PG - P5078 VI - 42 IP - Suppl 57 4099 - http://erj.ersjournals.com/content/42/Suppl_57/P5078.short 4100 - http://erj.ersjournals.com/content/42/Suppl_57/P5078.full SO - Eur Respir J2013 Sep 01; 42 AB - Background: Endobronchial ultrasonography using a guide sheath (EBUS-GS) is a method established for pulmonary lesions however, there are only few reports regarding lesions with ground glass opacity (GGO).Objective: To assess the diagnostic accuracy of GS for lesions with GGO.Methods: Between January 2010 and January 2013, 48 patients with a confirmed diagnosis of lung cancer underwent either surgery or GS. GS was performed using an endoscopic ultrasound system, which was equipped with a 20-MHz mechanical radial-type probe with an external diameter of 1.4 mm with GS. Bronchoscope with a working channel diameter of 2.0 mm was used. Three to 5 biopsy and brushing samples were taken for all patients. Subjects were then categorized by the ratio of solid area and GGO (longest diameter of tumor with mediastinal window / longest diameter of tumor with lung window ×100) on CT as pure GGO or mixed GGO (<25%, 25-50%, >50%).Results: The total diagnostic yield of GS in patients with GGO was 77.1%. Cytological diagnosis was 54.2%, and tissue diagnosis was 70.8%. The diagnostic accuracy when the position of the probe was outside the lesion was invisible was 0%, adjacent to the lesion was 71.4%, and within the lesion was 83.9%. The diagnostic accuracy visualized as typeIIa (hyperechoic points without open vessels) was 77.3%, typeIIb (hyperechoic points with open vessels) was 82.6%.Conclusions: GS for the diagnostic yield in patients with GGO was 77.1%. Increasing the solid part in the lesion, the population of typeIIb, within, and diagnostic yield increased.