title: [Bone manifestations in non-Hodgkin's lymphoma in childhood and adolescence].
abstract: OBJECTIVE
  Skeletal manifestation of Non-Hodgkin's lymphoma is rare in pediatric patients. Objective of the study was to determine imaging features, before and after treatment, and to correlate these features with clinical outcome.
  
  
  METHODS
  A retrospective analysis of 1246 patients from two therapy studies (NHL-BMF-90 and 95) was performed. Imaging studies of 63 patients with bone involvement of lymphoma were reevaluated.
  
  
  RESULTS
  Incidence of initial bone involvement in Non-Hodgkin's lymphoma was 6.8%. Distribution was best assessed by bone scan, MRI revealed larger areas of marrow involvement and detected additional lesions. Sites of predilection were long bones of the lower extremities with epiphyseal involvement in 39%. Residual signal alterations in MRI after successful therapy remained in 71%. Osteonecrosis after therapy was a common finding. Clinical outcome war not correlated to the presence of bone involvement.
  
  
  CONCLUSIONS
  Since clinical outcome is not effected by bone involvement in childhood NHL, value of screening may be limited. Knowledge of imaging characteristics is mandatory for initial evaluation of primary osseous lymphomas and symptomatic lesions as well as for therapy controls.
authors.affiliation: Abteilung für Diagnostische Radiologie I, Medizinische Hochschule Hannover. rosenthal.herbert@mh-hannover.de
authors.forename: H
authors.initials: H
authors.lastname: Rosenthal
authors.forename: R
authors.initials: R
authors.lastname: Kolb
authors.forename: K F
authors.initials: KF
authors.lastname: Gratz
authors.forename: A
authors.initials: A
authors.lastname: Reiter
authors.forename: M
authors.initials: M
authors.lastname: Galanski
mesh_terms: D000293:Adolescent; D001859:Bone Neoplasms / Q000175:diagnosis* / Q000556:secondary* / Q000628:therapy; D001842:Bone and Bones / Q000000981:diagnostic imaging / Q000473:pathology; D002648:Child; D006801:Humans; D008228:Lymphoma, Non-Hodgkin / Q000175:diagnosis* / Q000628:therapy; D008279:Magnetic Resonance Imaging; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D012189:Retrospective Studies; D013669:Technetium Tc 99m Medronate; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
chemical_list: D019275:Radiopharmaceuticals; D013669:Technetium Tc 99m Medronate