oproliferative disorders (PTLD) are lymphoid
cytic proliferations that develop as a consequence of immunosuppression
in a recipient of a solid organ, bone marrow
, or stem cell
allograft. The early lesions are defined as lymphoid
proliferations in an allograft recipient, characterized by architectual preservation of the involved tissue, with preservation of the nodular sinuses or tonsillar crypts, and residual or sometimes floridly reactive follicles in some cases.