title: Sonographically-detected impalpable testicular cancer with retroperitoneal bulky metastases: a case report.
abstract: We report a case of a sonographically-detected impalpable embryonal cell carcinoma with bulky retroperitoneal metastases. A 34-year-old man, who presented with left flank pain, was presumed to have an extragonadal retroperitoneal germ cell tumor. Scrotal sonography revealed a hypoechoic lesion, 7 mm in diameter, which was histologically diagnosed as a primary embryonal cell carcinoma. Evidence suggested that the primary tumor had grown slowly, as the tumor was well encapsulated. This case suggests that some extragonadal germ cell tumors arise from a primary testicular cancers, and that successful treatment of these tumors should include consideration that they may have arisen as a primary testicular mass.
authors.affiliation: Department of Urology, Sagamihara National Hospital, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Sakai
authors.forename: T
authors.initials: T
authors.lastname: Yamada
authors.forename: T
authors.initials: T
authors.lastname: Asao
authors.forename: T
authors.initials: T
authors.lastname: Murayama
mesh_terms: D000328:Adult; D001706:Biopsy; D054278:Embryonal Carcinoma Stem Cells; D006801:Humans; D008198:Lymph Nodes / Q000601:surgery; D008297:Male; D014411:Neoplastic Stem Cells / Q000000981:diagnostic imaging* / Q000473:pathology; D012186:Retroperitoneal Neoplasms / Q000556:secondary*; D013724:Teratoma / Q000556:secondary*; D013736:Testicular Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D014463:Ultrasonography