Fine-needle Biopsy Combined With Macroscopic On-site Evaluation for Diagnosis of Solid Pancreatic Lesions

Plain-language summary

The goal of this clinical trial is to compare the diagnostic efficacy, core tissue acquisition ability, number of punctures and puncture time of macroscopic on-site evaluation (MOSE) and two punctures alone in Endoscopic ultrasound guided fine-needle biopsy (EUS-FNB) for solid pancreatic lesions. The main questions it aims to answer is: whether the diagnostic accuracy of EUS-FNB performed with two needle passes is not inferior to that of MOSE. Participants with solid pancreatic lesions who needs histological diagnosis will receive EUS-FNB using 22G Franseen. In Group 1, the macroscopically visible core (MVC) of the specimen was assessed. If the MVC of the sample obtained from the first needle was ≥10mm, the tissue strip was placed in Bottle A and fixed with formalin. A second needle was then used to obtain another tissue strip, which was directly placed into Bottle B containing formalin. However, if the MVC of the first needle sample was \< 10mm, the puncture procedure was continued until the cumulative length of sample's MVC was ≥10mm, and all the sample collected during this process were placed into Bottle A and fixed with formalin. In Group 2, two needles were used to obtain tissue strips, and all the tissue strips were placed into Bottle A formalin. Researchers will compare the diagnostic efficacy, core tissue acquisition ability, number of punctures and puncture time between the MOSE technique and two-needle puncture method.

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