Figure 12b. Degenerating hepatic neurofibroma in a 23-year-old man with NF1 who complained of nausea and vomiting. (a) Longitudinal sonogram of the right lobe of the liver shows a solitary, complex, and echogenic mass. (b) Intravenous contrast-enhanced CT scan shows a heterogeneously hypointense mass with ill-defined borders in the right lobe of the liver.