BACKGROUND: Diffuse marrow replacement in acute leukemia is well known, but there are few reports describing the MRI features of pediatric leukemic relapse. OBJECTIVE: Our purpose was to describe the MRI appearance of pediatric leukemic relapse. MATERIALS AND METHODS: A total of 53 consecutive children with a history of ALL were referred for musculoskeletal MRI from 1 January 1998 to 28 February 2007 at one center, and from 1 January 2000 to 2 May 2007 at a second center. From this group, 14 children seen at initial diagnosis of leukemia and 2 children who underwent MRI after therapy for relapse were excluded. The remaining 37 children, 8 with relapse and 29 in remission, were studied. Images of patients with relapse and in remission were reviewed for type and configuration of marrow infiltration; coexisting marrow alterations including osteonecrosis or stress reaction were also reviewed. RESULTS: All eight children with relapse demonstrated nodular lesions with well-defined margins. Coexisting osteonecrosis was present in three children (38%) and pathologic fracture in one. Among the 29 children in remission, 9 showed stress reaction/fracture, 14 showed osteonecrosis and 9 showed ill-defined nodules, and in 5 the marrow was completely normal. CONCLUSION: Well-defined nodules in all patients with leukemic relapse suggest that this appearance is characteristic and distinct from the published findings of diffuse marrow replacement in acute leukemia.
BACKGROUND: Diffuse marrow replacement in acute leukemia is well known, but there are few reports describing the MRI features of pediatric leukemic relapse. OBJECTIVE: Our purpose was to describe the MRI appearance of pediatric leukemic relapse. MATERIALS AND METHODS: A total of 53 consecutive children with a history of ALL were referred for musculoskeletal MRI from 1 January 1998 to 28 February 2007 at one center, and from 1 January 2000 to 2 May 2007 at a second center. From this group, 14 children seen at initial diagnosis of leukemia and 2 children who underwent MRI after therapy for relapse were excluded. The remaining 37 children, 8 with relapse and 29 in remission, were studied. Images of patients with relapse and in remission were reviewed for type and configuration of marrow infiltration; coexisting marrow alterations including osteonecrosis or stress reaction were also reviewed. RESULTS: All eight children with relapse demonstrated nodular lesions with well-defined margins. Coexisting osteonecrosis was present in three children (38%) and pathologic fracture in one. Among the 29 children in remission, 9 showed stress reaction/fracture, 14 showed osteonecrosis and 9 showed ill-defined nodules, and in 5 the marrow was completely normal. CONCLUSION: Well-defined nodules in all patients with leukemic relapse suggest that this appearance is characteristic and distinct from the published findings of diffuse marrow replacement in acute leukemia.
Authors: S G Moore; C A Gooding; R C Brasch; R L Ehman; H G Ringertz; A R Ablin; K K Matthay; S Zoger Journal: Radiology Date: 1986-07 Impact factor: 11.105
Authors: P S Gaynon; R P Qu; R J Chappell; M L Willoughby; D G Tubergen; P G Steinherz; M E Trigg Journal: Cancer Date: 1998-04-01 Impact factor: 6.860
Authors: T Endo; N Sato; K Koizumi; M Nishio; K Fujimoto; T Sakai; K Kumano; M Obara; K Minauchi; T Koike Journal: Am J Hematol Date: 2004-07 Impact factor: 10.047