Non-Hodgkin's lymphoma with features of "Sternberg's sarcoma" manifesting as a pelvic mass.
D000293:Adolescent; D006801:Humans; D008223:Lymphoma / Q000473:pathology*; D008228:Lymphoma, Non-Hodgkin / Q000473:pathology*; D008297:Male; D010386:Pelvic Neoplasms / Q000473:pathology*