Diagnostic Efficacy Of 3 EUS-FNB Techniques

Using a linear echoendoscope, such as Pentax or Olympus, after identifying the lesion and deciding where to perform the EUS-FNB, always checking that there are no vessels on the eco-Doppler that would prevent puncture, a 22G Cook "Echo-Tip Procore" histology needle will be used to perform the following techniques of the described arms. \- Dry suction puncture: Once the lesion is located and punctured, the stylet will be completely removed, and a 10 mL syringe with a vacuum of 10 mL will be attached. In each pass, the needle will be advanced and retracted 20-30 times according to the standard technique. The suction will then be closed, and the needle will be removed. The "fanning" technique will be performed whenever possible.

Using a linear echoendoscope, such as Pentax or Olympus, after identifying the lesion and deciding where to perform the EUS-FNB, always checking that there are no vessels on the eco-Doppler that would prevent puncture, a 22G Cook "Echo-Tip Procore" histology needle will be used to perform the following techniques of the described arms.

Using a linear echoendoscope, such as Pentax or Olympus, after identifying the lesion and deciding where to perform the EUS-FNB, always checking that there are no vessels on the eco-Doppler that would prevent puncture, a 22G Cook "Echo-Tip Procore" histology needle will be used to perform the following techniques of the described arms. \- Wet suction technique: Prior to puncture, the stylet should be removed and the needle should be flushed with 1-2 ml of physiological saline and a 10 ml vacuum syringe with 3-5 ml of saline should be attached. In each pass, the needle should be moved forward and backward 20-30 times. Aspiration should be opened as the needle advances and closed as it is withdrawn. Afterwards, the aspiration should be closed and the needle should be removed. The "fanning" technique should be performed whenever possible.