clinically there were two groups : a ) young patients ( mean age , 23 years ) who presented soon ( mean , 9 months ) after transplantation or antirejection therapy with fever , pharyngitis , and lymphadenopathy resembling infectious mononucleosis , and b ) older patients ( mean age , 48 years ) who presented later ( mean , 6 years ) after transplantation with localized tumor masses .
C0577559
localized
C0027651
tumor