Tract creation with a 25-gauge needle for convex endobronchial ultrasound-guided core biopsy in intrapulmonary lesions adjacent to bronchi: three case reports.

Background: The use of endobronchial ultrasound-guided core biopsy (EBUS-CB) using forceps or cryoprobes to obtain true histological samples has improved the diagnostic yield for mediastinal and hilar lymphadenopathy. Tract creation in the bronchial wall of the central airway is primarily performed using electrocautery devices in EBUS-CB; however, their poor maneuverability and the risk of vascular injury and damage to the tip of the bronchoscope have prevented the application of EBUS-CB for diagnosing intrapulmonary lesions beyond the central locations. This report presents three cases wherein a 25-gauge transbronchial needle aspiration (TBNA) needle with high flexibility and safety was used to create a tract in the bronchial wall for EBUS-CB of the intrapulmonary lesions adjacent to the bronchi.

Case Description: In all cases, EBUS-TBNA using a 25-gauge TBNA needle was performed on the intrapulmonary lesions adjacent to the bronchi, followed by EBUS-CB with 1.9-mm forceps in two cases and also with a 1.1-mm cryoprobe in one case. The EBUS-TBNA specimens revealed no abnormality or only a small number of tumor cells. However, subsequent EBUS-CB, through the tract created by EBUS-TBNA, enabled the collection of a sufficient amount of histological samples with well-preserved histoarchitecture. The histological diagnosis was made via immunostaining, and multigene mutation testing was also successfully analyzed.

Conclusions: The use of a 25-gauge needle for creating a tract allows EBUS-CB for the intrapulmonary lesions and may allow for the collection of sufficient histological samples for biomarker analysis and tissue diagnosis.