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Patient.  A 65-year-old man was admitted with a large primary retroperitonealtumor and an increased β-human chorionic gonadotropin (β-HCG) serum level. A germcell tumor was suspected; however, a computed tomography-guided biopsy failed to enabletumor classification. After two courses of chemotherapy, the β-HCG serum level had returnedto the normal level and a diagnostic laparotomy with incisional biopsy was performed.The immunohistochemical examination of the specimen identified the tumor as aretroperitoneal pleomorphic leiomyosarcoma

Retroperitoneal Leiomyosarcoma Associated with an Elevated β-HCG Serum Level Mimicking Extragonadal Germ Cell Tumor