title: Pulmonary post-transplant lymphoproliferative disorder with a CT halo sign.
abstract: BACKGROUND
  Post-transplant lymphoproliferative disease (PTLD) comprises a spectrum of clinically relevant lymphatic diseases that occur in patients after transplantation. The PTLD-related mortality is high and the clinical picture and location of the lesions are very variable. For these reasons, the diagnosis of PTLD is difficult and new diagnostic tools are sought.
  
  
  METHODS
  A 31-year-old woman, 17 years after kidney transplantation, presented with recurrent upper respiratory tract infections, fever, and weakness and was diagnosed with pulmonary PTLD. Computed tomography appearance was not typical for lymphoma and demonstrated multiple bilateral pulmonary nodules and masses with a halo sign. Initial differential diagnosis included invasive pulmonary aspergillosis and acute Wegener granulomatosis. Since cultures from bronchoalveolar lavage and anti-neutrophil cytoplasmic antibodies were negative, videothoracoscopy with lung biopsy was performed. Pathology analysis revealed diffuse large T-cell lymphoma with histopathologic features of infiltrative growth along the lung interstitium, vessel invasion, and hemorrhagic necrosis possibly explaining the presence of a halo sign.
  
  
  CONCLUSIONS
  We suggest PTLD should always be suspected in a transplant recipient presenting with the CT halo sign. Moreover, the correlation of this radiological phenomenon with the patient's clinical presentation and severe pathologic findings allows us to conclude that the thoracic halo sign in PTLD may reflect a worse prognosis.
authors.affiliation: Department of Immunology, Transplantology, and Internal Medicine, Medical University of Warsaw, Warsaw, Poland.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Mucha
authors.forename: Bartosz
authors.initials: B
authors.lastname: Foroncewicz
authors.forename: Piotr
authors.initials: P
authors.lastname: Palczewski
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Sułkowska
authors.forename: Bogna
authors.initials: B
authors.lastname: Ziarkiewicz-Wróblewska
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Orłowski
authors.forename: Marek
authors.initials: M
authors.lastname: Gołębiowski
authors.forename: Leszek
authors.initials: L
authors.lastname: Pączek
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D016030:Kidney Transplantation / Q000009:adverse effects*; D008168:Lung / Q000000981:diagnostic imaging* / Q000473:pathology; D016399:Lymphoma, T-Cell / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology; D008232:Lymphoproliferative Disorders / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology; D011859:Radiography