title: Preoperative radiological characterization of hepatic angiomyolipoma using magnetic resonance imaging and contrast-enhanced ultrasonography: a case report.
abstract: BACKGROUND
  A hepatic angiomyolipoma is a rare benign tumor of the liver composed of a mixture of smooth muscle cells, blood vessels and a variable amount of adipose tissue. Differentiating them from malignant liver tumors can often be very difficult.
  
  
  METHODS
  We report the case of a 43-year-old Caucasian man presenting with a large liver mass in the right lobe. The results of magnetic resonance imaging and contrast-enhanced ultrasonography were consistent with a well-demarcated adipose tissue- containing tumor, showing prolonged hyperperfusion in comparison with the surrounding liver tissue. Surgery was performed and the diagnosis of hepatic angiomyolipoma was made with histopathology.
  
  
  CONCLUSIONS
  Preoperative radiological characterization using magnetic resonance imaging and contrast-enhanced ultrasonography may improve diagnostic accuracy of hepatic angiomyolipoma. Identification of smooth muscle cells, blood vessels and adipose tissue with a positive immunohistochemical reaction for HMB-45 is the final evidence for an angiomyolipoma.
authors.affiliation: Medical Clinic, Klinikum rechts der Isar, Technische Universität München, Munich, Germany. oliver.ebert@lrz.tum.de.
authors.forename: Stephanie
authors.initials: S
authors.lastname: Krebs
authors.forename: Irene
authors.initials: I
authors.lastname: Esposito
authors.forename: Christian
authors.initials: C
authors.lastname: Lersch
authors.forename: Jochen
authors.initials: J
authors.lastname: Gaa
authors.forename: Roland M
authors.initials: RM
authors.lastname: Schmid
authors.forename: Oliver
authors.initials: O
authors.lastname: Ebert