title: Can kidney posttransplant lymphoproliferative disorder be detected in voided urine? A case report.
abstract: BACKGROUND
  Posttransplant lymphoproliferative disorder (PTLPD) is a relatively common complication in kidney transplant recipients. It can involve the kidney allograft itself as well as extragraft sites. It is usually suspected clinically and diagnosed by tissue biopsy. It comprises a spectrum of lesions ranging from lymphoid byperplasia to frank lymphoma.
  
  
  METHODS
  A 21-year-old male presented with recurrent episodes of microhematuria 2 years after a renal transplant. Voided urine cytology showed anaplastic, discohesive cells. Immunocytochemistry study on a urine cytospin showed the cells to be positive for LCA, CD20 and for CD79a and negative for CD3, CD15, CD30, cytokeratin, S-100 and HMB45, confirming their lymphoid origin.
  
  
  CONCLUSIONS
  This is a rare suspected occurrence of PTLPD in voided urine. The presumptive diagnosis was supported by immunocytochemistry. However, voided urine cytology should not be considered a standard diagnostic test due to its low sensitivity. Diagnosis and proper subclassification of kidney PTLPD should be confirmed by histologic tissue study with supportive ancillary studies--e.g., immunohistochemistry and flow cytometry.
authors.affiliation: Cytology Unit, Histopathology Department, Dubai Hospital, Dubai, United Arab Emirates. badraah009@yahoo.com
authors.forename: Badr
authors.initials: B
authors.lastname: AbdullGaffar
authors.forename: Mohamed O
authors.initials: MO
authors.lastname: Kamal
authors.forename: Manar
authors.initials: M
authors.lastname: Khalid
authors.forename: Ravirani
authors.initials: R
authors.lastname: Samuel
authors.forename: Nasser
authors.initials: N
authors.lastname: AlAbsi
authors.forename: Fakhriayh
authors.initials: F
authors.lastname: AlAwadi
mesh_terms: D018951:Antigens, CD20 / Q000032:analysis; D051925:CD79 Antigens / Q000032:analysis; D003581:Cytodiagnosis / Q000379:methods; D006801:Humans; D007150:Immunohistochemistry; D016030:Kidney Transplantation / Q000009:adverse effects*; D017493:Leukocyte Common Antigens / Q000032:analysis; D008214:Lymphocytes / Q000378:metabolism / Q000473:pathology; D008232:Lymphoproliferative Disorders / Q000175:diagnosis / Q000209:etiology / Q000652:urine*; D008297:Male; D011183:Postoperative Complications / Q000175:diagnosis / Q000209:etiology / Q000652:urine*; D055815:Young Adult
chemical_list: D018951:Antigens, CD20; D051925:CD79 Antigens; D017493:Leukocyte Common Antigens