Which findings on radionuclide imaging are characteristic of fibrolamellar hepatocellular carcinoma?

Updated: Sep 05, 2019
  • Author: W Ross Stevens, MD; Chief Editor: John Karani, MBBS, FRCR  more...
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Answer

Radionuclide imaging studies are not useful in the detection of fibrolamellar carcinoma. However, in some patients, these studies may be useful in the differential diagnosis of the tumors.

On sulfur-colloid liver-spleen scans, fibrolamellar carcinomas appear as photopenic defects in the liver; the masses demonstrate decreased activity. On scans obtained with red blood cells labeled with technetium-99m (99mTc), fibrolamellar carcinomas typically demonstrate increased activity on early arterial-phase images. This finding is followed by decreased activity with respect to the surrounding liver on delayed-phase images.

In difficult or equivocal cases, radionuclide sulfur-colloid images or images obtained with labeled red blood cells may provide information that increases the level of confidence in the diagnosis of fibrolamellar carcinoma. However, these studies are not useful in detecting or staging fibrolamellar carcinoma.

Sulfur-colloid liver-spleen scans can demonstrate photopenic lesions in the liver with many entities, including benign and malignant liver tumors, cysts, and abscesses; therefore, false-positive results are possible. False-negative sulfur-colloid scans may occur when diffuse hepatocellular dysfunction, such as cirrhosis, results in poor tracer uptake in a noncancerous liver.

Other liver tumors may have uptake patterns on labeled red blood cell scans that are similar to the uptake pattern of fibrolamellar carcinoma; therefore, false-positive findings can result. The tumors may demonstrate normal activity levels, resulting in a false-negative finding.


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