Focal liver lesions: pattern-based classification scheme for enhancement at arterial phase CT
M Nino-Murcia1, E W Olcott, R B Jeffrey
1Department of Radiology, Stanford University Medical Center, CA, USA. ninomurcia@forsythe.stanford.edu
Radiology
|June 1, 2000
Summary
A new classification scheme for arterial phase computed tomography (CT) enhancement patterns of focal liver lesions shows promise. Specific patterns accurately suggest diagnoses like hepatocellular carcinoma, hemangioma, and metastasis.
Area of Science:
- Radiology
- Medical Imaging
- Oncology
Background:
- Focal liver lesions require accurate diagnosis for appropriate patient management.
- Computed tomography (CT) is a key imaging modality for evaluating liver lesions.
- Arterial phase imaging provides crucial information about lesion vascularity.
Purpose of the Study:
- To introduce and evaluate a classification scheme for focal liver lesions based on arterial phase CT enhancement patterns.
- To determine if specific enhancement patterns can predict particular diagnoses of liver lesions.
Main Methods:
- Retrospective review of arterial phase CT scans in 100 patients with focal liver lesions.
- Classification of lesion enhancement patterns into five categories by blinded radiologists.
- Correlation of enhancement patterns with definitive diagnoses (histology, imaging follow-up).
Main Results:
- Ninety-two percent of lesions exhibited arterial phase enhancement.
- Specific patterns demonstrated high positive predictive values and specificity: abnormal internal vessels/variegated (hepatocellular carcinoma), peripheral puddles (hemangioma), and complete ring (metastasis).
Conclusions:
- Arterial phase CT enhancement patterns are valuable for diagnosing focal liver lesions.
- The proposed classification scheme can aid in interpreting arterial phase CT studies for liver lesions.
