The goal of this observation study is to assess whether endoscopic ultrasound shear wave elastography (EUS-SWE) may be a useful tool for liver fibrosis screening in patients with elevated body mass index and non alcoholic fatty liver disease as compared to other non-invasive screening modalities, which have traditionally had less accurate results in this population. The main questions it aims to answer are: * Determine accuracy of EUS-SWE for liver fibrosis screening compared to other non-invasive scoring systems, such as the FIB-4 score and Fibroscan in patients with elevated body mass index * Establish optimal stiffness (kPa) cutoffs for liver fibrosis grading for EUS-SWE for this patient population in reference to the gold standard liver biopsy, as no standard cutoffs currently exist. Participants will undergo routine endoscopic ultrasound as part of their standard clinical care and indication. Participants are consented for the procedure and undergoing the shear wave elastography. In addition to their standard ultrasound test, it takes on average an extra 2-3 minutes to perform the shear wave elastography. The procedure itself adds no additional risk to the patient and does not expose them to radiation.
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Accuracy of EUS-SWE in reference to the gold standard liver biopsy
Timeframe: Up to 6 months
Optimal stiffness cutoffs for EUS-SWE based on AUROC analysis
Timeframe: Up to 6 months