An undifferentiated embryonal sarcoma of the liver containing adipophilin-positive vesicles in an adult with massive sinusoidal invasion.
Undifferentiated embryonal sarcoma of the liver (UESL) is a malignant mesenchymal tumor that occurs typically in children and rarely in adults. Here we describe a case of UESL in a 51-year-old woman who presented with a cystic lesion in the liver. Because it grew slowly, the anterior segment of the liver was resected to check the lesion. Histologically, the lesion looked like a telangiectatic hepatic adenoma. Two years after resection, the tumor recurred, and she died 3 years later due to liver failure. The autopsy revealed that these lesions were UESL with massive sinusoidal invasion, and a review of the case indicated the primary lesion was also UESL. We also confirmed these tumor cells by staining with CD56, alpha-smooth muscle actin (SMA), and adipophilin, suggesting that they have a character similar to that of stellate cells in the space of Disse. The histological result of our patient revealed atypical UESL. Therefore, UESL should be considered when a hepatic lesion with degeneration is seen, even in an adult. In addition, the immunohistochemical appearance of this case implies that UESL is perhaps derived from stellate cells or stellate cells with myofibroblast differentiation in the space of Disse.
Department of Pathology, Sapporo Medical University School of Medicine Chuou-ku, Minami-1, Sapporo, Japan. binntana@sapmed.ac.jp
Satoshi
S
Tanaka
Akira
A
Takasawa
Yuichiro
Y
Fukasawa
Tadashi
T
Hasegawa
Norimasa
N
Sawada
D000199:Actins / Q000378:metabolism; D000236:Adenoma / Q000175:diagnosis; D014408:Biomarkers, Tumor / Q000378:metabolism*; D019002:CD56 Antigen / Q000378:metabolism; D003937:Diagnosis, Differential; D017809:Fatal Outcome; D005260:Female; D006801:Humans; D017093:Liver Failure; D008113:Liver Neoplasms / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D008565:Membrane Proteins / Q000378:metabolism*; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D000070780:Perilipin-2; D012509:Sarcoma / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology*; D014463:Ultrasonography
C541116:ACTA2 protein, human; D000199:Actins; D014408:Biomarkers, Tumor; D019002:CD56 Antigen; D008565:Membrane Proteins; C522918:NCAM1 protein, human; C000602982:PLIN2 protein, human; D000070780:Perilipin-2