The heterogeneous liver scan: ultrasound correlation

Area of Science:

• Nuclear Medicine
• Diagnostic Imaging
• Hepatology

Background:

• Metastatic disease to the liver is a common clinical challenge.
• Accurate detection of liver metastases is crucial for patient management.
• Heterogeneous liver scans can present diagnostic difficulties.

Purpose of the Study:

• To compare the efficacy of technetium-99m sulfur colloid liver scans with ultrasound in detecting liver metastases.
• To evaluate the utility of ultrasound in cases of heterogeneous nuclear scans.

Main Methods:

• Retrospective analysis of 55 technetium-99m sulfur colloid liver scans from 48 patients.
• Comparison of nuclear scan results with gray-scale ultrasound findings.
• Categorization of nuclear scan heterogeneity as mild, moderate, or severe.

Main Results:

• In mild to moderate heterogeneous scans (52 cases), ultrasound showed 67% normal, 21% hepatocellular disease, and 2 false positives.
• Ultrasound failed to detect space-occupying lesions in most mild to moderate heterogeneous nuclear scans.
• Ultrasound detected tumor in 1 of 3 patients with severely mottled nuclear scans.

Conclusions:

• Ultrasound is not recommended for evaluating mild to moderately heterogeneous technetium-99m sulfur colloid liver scans for space-occupying lesions.
• Nuclear medicine remains valuable for initial assessment of heterogeneous liver scans.
• Ultrasound may have a role in severely mottled nuclear scans.