A misleading hepatic tumour: epithelioid angiomyolipoma

Acta Gastroenterol Belg. 2012 Dec;75(4):443-5.

Abstract

Hepatic angiomyolipoma (HAML) is a rare, benign mesenchymal neoplasm composed of varying amounts of smooth muscle cells, adipose tissue, and vessels. Its morphological diversity often poses diagnostic problems. In this paper, the authors report a peculiar case of epithelioid HAML mimicking histologically hepatocellular carcinoma with focal areas resembling inflammatory pseudotumour. A 57 year-old male patient presented with abdominal pain and discomfort. Non enhanced CT scan demonstrated a heterogeneous hypodense mass located in segment II and IV of the liver. Hepatocellular carcinoma was suspected and the patient underwent left lobectomy. Histologically, the tumour was mainly composed of epithelioid cells arranged in trabeculae and sheets (50% of the tumour surface) admixed with mature fat cells (20%) and thick-walled blood vessels. Lymphocytic aggregates and clusters of foamy histiocytes were focally found in the stroma (30%). Most of the epithelioid tumour cells were immunoreactive to homatropine methylbromide 45 (HMB-45) and smooth muscle actin. Morphological pattern and immunophenotype were consistent with epithelioid HAML.

Publication types

  • Case Reports

MeSH terms

  • Angiomyolipoma / diagnosis*
  • Carcinoma, Hepatocellular / diagnosis*
  • Diagnosis, Differential
  • Epithelioid Cells / immunology
  • Epithelioid Cells / pathology
  • Granuloma, Plasma Cell / diagnosis*
  • Hepatectomy / methods*
  • Humans
  • Immunohistochemistry
  • Liver / pathology*
  • Liver Neoplasms / diagnosis*
  • Male
  • Middle Aged
  • Postoperative Care / methods
  • Tomography, X-Ray Computed
  • Treatment Outcome
  • Tropanes / immunology

Substances

  • Tropanes
  • homatropine methylbromide