A case of primary perivascular epithelioid cell tumor (PEComa) of the Caudate Lobe Diagnosed Using Endoscopic Ultrasound−Guided Fine−needle Aspiration

Abstract

The patient was a 43-year-old woman who was admitted to our hospital for an abdominal ultrasonography, that revealed a liver tumor. Computed tomography and magnetic resonance imaging showed a solid hepatic tumor, with adipose components, measuring 39 mm in her caudate lobe. We could not rule out the possibility of hepatocellular carcinoma.
Histopathological examination of the tumor specimen obtained by using endoscopic ultrasound-guided fine-needle aspiration showed enlarged alveolars cells with oval nuclei and eosinophilic cytoplasm, and enlarged clear cells with clear cytoplasm. The tumor cells stained positive for α-SMA and HMB-45, and thereby a diagnosis of PEComa was made.