text: Yo, check it out, here's the lowdown,
  Posttransplant B-cell lymphoproliferative disorders, known as PTLDs, yo,
  They're a diverse crew, with hyperplastic and polymorphic lesions,
  On one side, and lymphoid proliferations, straight up non-Hodgkin lymphomas, no messin'.
  
  Most PTLDs come from B-cells, that's the deal,
  But there's a few rare cases with a T-cell appeal,
  We got lots of info on their looks and how they form,
  But when it comes to flow cytometric evaluation, we're lackin' norm.
  
  Yeah, we know the pathogenetic role of Epstein-Barr virus,
  And the different treatments that inspire us,
  But when it comes to diggin' deep with immunophenotypic flow,
  There's a gap in knowledge, we gotta let it show.