title: Perivascular epithelioid cell tumor (PEComa) of the liver diagnosed by contrast-enhanced ultrasonography.
abstract: Perivascular epithelioid cell (PEC) is a unique cell which expresses both myogenic and melanocytic markers, and forms PEComa. A 36-year-old woman presented with a 35 mm-diameter liver tumor. MRI showed poor fat component in the tumor. Contrast-enhanced ultrasonography using the newly developed enhancing reagent, Sonazoid, clearly demonstrated early-phase enhancement of the tumor and rapid drainage of the reagent to veins, suggesting a PEComa. Lateral segmentectomy of the liver was performed. Histologically, epithelioid tumor cells around the vessels were immunostained with both HMB-45 and alpha-smooth muscle actin, confirming the diagnosis of PEComa. No recurrence has been found for 18 months following the operation.
authors.affiliation: Division of Gastroenterology, Kyoto First Red Cross Hospital, Kyoto.
authors.forename: Reiko
authors.initials: R
authors.lastname: Akitake
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kimura
authors.forename: Satoru
authors.initials: S
authors.lastname: Sekoguchi
authors.forename: Hideki
authors.initials: H
authors.lastname: Nakamura
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Seno
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Chiba
authors.forename: Sotaro
authors.initials: S
authors.lastname: Fujimoto
mesh_terms: D000328:Adult; D003287:Contrast Media; D005260:Female; D005290:Ferric Compounds; D006801:Humans; D007501:Iron; D008113:Liver Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000601:surgery; D010087:Oxides; D054973:Perivascular Epithelioid Cell Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000601:surgery; D014463:Ultrasonography
chemical_list: D003287:Contrast Media; D005290:Ferric Compounds; D010087:Oxides; C069727:Sonazoid; D007501:Iron