Diagnosis of hepatic fibrosis is challenging as specific tests for detection of fibrosis in pediatric Cystic Fibrosis associated liver disease (CFALD) have not been developed and existing investigations do not correlate well with presence or severity of disease. Using a Liver biopsy it is difficult to diagnose this condition because of the patchy nature of the disease. Investigators intend to identify hepatic and pancreatic fibrosis in Cystic Fibrosis patients using Elastography and correlate this with their biochemical markers as well as histological findings of patients who have undergone liver biopsy for diagnosis of CFALD.