... immunosuppression reduction, often polyclonal,no genetic abnormalities, and often not fatal; (2) polymor-phous PTLD: a proliferation of lymphoid cells consisting of amixture of small and large lymphocytes, ... lymphnode as the site of latency.224Reactivation of the virus canlead to the development of the aforementioned malignancies,the most common of which is KS. Almost all cases of KScontain the ... Medicine,Hospital of the University of Pennsylvania, Philadelphia.Address reprint requests to Dr Montone: Dept of Pathologyand Laboratory Medicine, Hospital of the University of Pennsylvania,...