Liver tumour MRI: what do we need for lesion characterization?

Area of Science:

• Radiology
• Medical Imaging
• Oncology

Background:

• Hepatic lesions present a diagnostic challenge in clinical radiology.
• Non-invasive characterization of liver tumors is crucial for patient management.
• Magnetic resonance imaging (MRI) offers potential for evaluating liver lesions.

Purpose of the Study:

• To assess the lesion characterization capabilities of MRI.
• To evaluate the performance of unenhanced MR sequences and dynamic gadolinium (Gd)-enhanced techniques.
• To compare the diagnostic accuracy of single versus combined MR sequences.

Main Methods:

• Retrospective analysis of 116 focal liver lesions in 116 patients.
• Inclusion of histological verification for 107 lesions and 2-year follow-up for 9 hemangiomas.
• Evaluation of T1- and T2-weighted sequences and dynamic Gd-enhanced studies by two readers using a 1.5-T MR system.

Main Results:

• Multisequential MRI achieved 83-89% accuracy in classifying lesions as benign or malignant.
• Gd-enhanced T1-weighted sequences provided the best single-sequence classification.
• Combined sequences significantly improved classification accuracy (P = 0.02) and specific diagnosis (60-71%).

Conclusions:

• Multisequential MRI, particularly with Gd-enhanced imaging, excels in liver lesion classification.
• The combination of sequences demonstrates moderate ability in determining specific diagnoses.
• MRI is a valuable tool for non-invasive characterization of hepatic lesions.