Which findings on ultrasonography 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

Abdominal ultrasonograms are often obtained for the initial evaluation of patients with abdominal pain; therefore, ultrasonography may be the first imaging study available in patients with fibrolamellar carcinoma. On ultrasonograms, the primary tumor can be seen as a solitary, well-defined hepatic mass with a heterogeneous echotexture (as demonstrated in the image below). The tumor's scar may be seen as a central, hyperechoic structure, and calcification may be represented by an echogenic focus with shadowing. [8]

Ultrasonogram shows a heterogeneous echotexture ma Ultrasonogram shows a heterogeneous echotexture mass in the liver that corresponds to a fibrolamellar carcinoma.

Because the primary intrahepatic tumors of fibrolamellar carcinoma are often large, the likelihood of detecting the mass with ultrasonography is high. However, ultrasonography is less sensitive than CT scanning in depicting tumoral characteristics, such as scars and calcifications, which aid in the differentiation of fibrolamellar carcinoma from other intrahepatic tumors. Ultrasonography is less accurate than CT scanning in staging extrahepatic disease. After the initial detection of the intrahepatic mass with ultrasonography, further evaluation with CT scanning or MRI is usually necessary for the definitive diagnosis and staging of fibrolamellar carcinoma.

Although, in a young patient, a large intrahepatic mass with a central scar is suggestive of fibrolamellar carcinoma, other entities (eg, FNH, hepatocellular adenoma, possibly giant cavernous hemangioma) may have a similar appearance on ultrasonograms and result in false-positive findings. False-negative ultrasonographic findings may occur in patients with obesity, underlying cirrhosis or fatty infiltration (which is not typical in patients with fibrolamellar carcinoma), or a body habitus that may obscure good visualization of the liver during ultrasonography.


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