Concept:
Observation is probably malignant, but imaging features are not specific for HCC
Definition:
Characteristic imaging features:
- Features that favor other malignancy over HCC include (partial list):
- Features that favor HCC over other malignancy include (partial list):
If unsure about category:
- LR-M observations must be reported.
- Since LR-M observations represent (or may represent) non-HCC malignancy, their presence can substantially alter patient management. Thus LR-M observations must be reported.
- LR-M observations may be reported in aggregate if there are many lesions which are similar in character.
Management implications:
- Variable, depending on type of malignancy suspected.
- Appropriate management may include follow-up, additional imaging, biopsy, resection, or other treatment.
- Does not contribute to HCC radiology T staging and does not provide HCC exception points for determining priority on liver transplantation list, unless tissue sampling with histology analysis establishes a diagnosis of HCC. See UNOS/OPTN policy.
- An LR-M observation proven to be HCC at histology should be categorized LR-5 at follow-up imaging.