Development of Novel Imaging and Molecular Biomarkers of Fibrosis in Patient With Ulcerative Colitis

Inclusion Criteria: * Adult, 18 years of age and older, * Established diagnosis (\> three months) of ulcerative colitis, * Performing colonoscopy, according to current standards of care and ECCO guidelines, * Ability to understand and comply with the study procedure and sign an informed consent form Exclusion Criteria: * Pregnancy, * presence of ascites, active infections, any contraindication to colonoscopy (e.g. intolerance to preparation, severe flare), * inability to undergo intestinal ultrasound within the time set by the study, * poor quality of ultrasound imaging (due to luminal gas or body habitus), or a diagnosis of malignancy in the pathological specimen. * subjects who needs to change therapy