Targeted sonography for small hepatocellular carcinoma discovered by CT or MRI: factors affecting sonographic...

Area of Science:

• Hepatobiliary imaging
• Diagnostic radiology
• Oncology

Background:

• Hepatocellular carcinoma (HCC) is a common primary liver cancer.
• Early detection of small HCCs is crucial for effective treatment.
• CT and MRI are primary tools for HCC discovery.

Purpose of the Study:

• To determine the detection rate of targeted ultrasonography for small HCCs (
• To identify factors influencing the visibility of these small HCCs during targeted ultrasound examinations.

Main Methods:

• Prospective study of cirrhotic patients with small HCCs (October 2005 - April 2008).
• Targeted ultrasonography performed by a radiologist aware of HCC size and location.
• Statistical analysis (univariate and multivariate) to compare visible vs. invisible HCCs based on various factors.

Main Results:

• Overall detection rate for small HCCs (
• Detection rates varied by size: 36.4% for <=1.0 cm, 77.6% for 1.1-2.0 cm, and 93.9% for 2.1-3.0 cm.
• Tumor size and distance from the diaphragm were significant factors affecting sonographic visibility.

Conclusions:

• Targeted ultrasonography is effective in detecting a majority of small HCCs.
• Smaller tumor size and subphrenic location independently predict sonographic invisibility.
• These findings aid in optimizing ultrasound surveillance for HCC.