Figure 1.

a: The pulmonary CT scan showed a nodule with estimated diameter about 27×25mm in basal segment of the right lower lobe. Without guidance of VBN, ultrasonic radial probe was advanced into the lateral branch of the lesion (yellow arrow). b: The ultrasonic image showed that only one strip suspicious solitary density shadow was found on the edge of the probe with the longest diameter of 9mm. In the second procedure, EBUS-GS was advanced into the center position of lesion (red arrow) in the posterior basal segment of right lower lung under the guidance of VBN 3D electronic path. c: Ultrasonic image showed the typical solidary circular density shadow with clear boundary edge with the longest diameter about 12mm. The radial probe was located within the lesion.