The<unk> ver Imaging Reporting and Data System (aka<unk>  is a quality assurance tool created and trademarked by the American College of Radiology in 2011 to standardize the reporting and data collection of CT and MR imaging patients at risk for hepatocellular carcinoma (HCC), or primary cancer of the<unk> ver cells. It provides a standardized framework for classification of<unk> ver lesions by a radiologist, and only applies in patients with chronic<unk> ver disease, the main risk factor for<unk> ver cancer. The hierarchical classification, from LR1 to LR5, is based on specific imaging features of the lesion in question, and corresponds to the degree of suspicion for malignancy. For example, a lesion with features corresponding to the highest category, LR5, is "definitely" HCC. Importantly, the increasing acceptance of the<unk>  system of reporting by referring clinicians (chiefly oncologists, hepatobiliary and<unk> ver transplant surgeons) has reduced the need for tissue biopsy confirmation of cancer in patients with chronic<unk> ver disease. The<unk>  system has undergone two revisions, first in 2014, and again in July 2018. In 2016, the ACR published a version of<unk>  which applies to contrast-enhanced ultrasound imaging, termed CEUS<unk> .
LI-RADS
PI-RADS
BI-RADS
TNM staging system
OSCAR McMaster
Pipkin classification
N-localizer
SCAPER