title: Krukenberg tumor with yolk sac tumor differentiation.
abstract: An unusual case of bilateral Krukenberg tumor with foci of yolk sac tumor (YST) differentiation occurring in a 50-year-old patient is reported. The primary tumor was in the gastric antrum, and it showed morphology of poorly differentiated adenocarcinoma with diffuse and solid growth pattern. A component of typical YST was not found in the gastric primary and lymph node metastases, although some cells in these locations were positive for alpha-fetoprotein. In the ovarian metastases, YST element showed microcystic/reticular and solid patterns, whereas the adenocarcinoma component was of diffuse type with signet ring cells and with some undifferentiated areas. The case represents further example of the somatic cell-derived tumor with focal germ cell-type differentiation and the first report of YST differentiation in Krukenberg tumor.
authors.affiliation: Sikl's Department of Pathology, Charles University. zamecnik@medima.cz
authors.forename: Michal
authors.initials: M
authors.lastname: Zamecnik
authors.forename: Lubomir
authors.initials: L
authors.lastname: Voltr
authors.forename: Jan
authors.initials: J
authors.lastname: Stuk
authors.forename: Alena
authors.initials: A
authors.lastname: Chlumska
mesh_terms: D014408:Biomarkers, Tumor / Q000378:metabolism; D002272:Carcinoembryonic Antigen / Q000378:metabolism; D002454:Cell Differentiation; D003937:Diagnosis, Differential; D018240:Endodermal Sinus Tumor / Q000175:diagnosis / Q000378:metabolism / Q000473:pathology*; D005260:Female; D006801:Humans; D053554:Keratin-20 / Q000378:metabolism; D053552:Keratin-7 / Q000378:metabolism; D007725:Krukenberg Tumor / Q000175:diagnosis / Q000378:metabolism / Q000473:pathology*; D008875:Middle Aged; D010051:Ovarian Neoplasms / Q000175:diagnosis / Q000378:metabolism / Q000473:pathology*
chemical_list: D014408:Biomarkers, Tumor; D002272:Carcinoembryonic Antigen; D053554:Keratin-20; D053552:Keratin-7