American Board of Surgery Qualifying Exam (ABS QE) Practice Test

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What is a characteristic feature of Focal Nodular Hyperplasia (FNH)?

Hypoattenuation
Isodense, homogeneous
Hyperattenuation
Mixed density

The correct answer is: Isodense, homogeneous

Focal Nodular Hyperplasia (FNH) is characterized by its isodense, homogeneous appearance on imaging studies, particularly on CT scans. This means that FNH typically does not present with areas of density variation when compared to the surrounding liver tissue, making it appear of similar density. This uniformity is due to the composition of the lesion, which is primarily made up of normal liver cells and fibrous tissue. When evaluating FNH, imaging studies will often demonstrate a well-defined mass that may enhance with contrast but retains its homogeneous density compared to the surrounding liver. This characteristic helps in distinguishing FNH from other liver lesions, which may demonstrate varying degrees of hypoattenuation or hyperattenuation based on their composition, such as fat or hemorrhage.