What is the accuracy of CT scans for the evaluation 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 CT scanning is sensitive in detecting the primary intrahepatic tumors of fibrolamellar carcinoma and of regional lymph node metastases. When found in the appropriate clinical setting of a young patient without cirrhosis, the characteristic CT scan appearance of a large, lobulated, heterogeneously enhancing tumor with a central scar and calcification, often with local lymph node metastases, can provide a confident diagnosis of fibrolamellar carcinoma. Because most patients are treated with surgical resection, percutaneous biopsy may be useful in the preoperative confirmation of the diagnosis.

In an atypical clinical setting, fibrolamellar carcinomas may be confused with hepatocellular adenomas or HCC, which can have a similar appearance. HCC often presents as a single, large, well-circumscribed encapsulated hypoattenuating lesion on unenhanced CT, while other tumor features such as fat involvement, foci of hemorrhage, and necrotic areas are more common in noncirrhotic HCC. [20] .

Focal nodular hyperplasia (FNH) can appear similar to fibrolamellar tumors, but its enhancement tends to be more homogeneous. Also, FNH has an enhancing scar, and it does not metastasize. [13]


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