Semiquantitative Assessment of Skeletal Response to Enzyme Replacement Therapy for Gaucher's Disease Using the Bone Marrow Burden Score
Patricia L. Robertson1,
Mario Maas2 and
Jack Goldblatt3
1 Department of Radiology, The University of Melbourne, Royal Melbourne
Hospital, Grattan St., Parkville, Melbourne, Victoria 3050, Australia.
2 Department of Radiology, Academic Medical Centre, University of Amsterdam,
Amsterdam, The Netherlands.
3 School of Paediatrics and Child Health, University of Western Australia,
Perth, WA, Australia.

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Fig. 1A Pretreatment MR images in 44-year-old woman with newly
diagnosed Gaucher's disease. Sagittal T1-weighted (A) and T2-weighted
(B) images of lumbar spine show bone marrow of lower signal intensity
than disk and presacral fat. Score for signal intensity was 4 and for
distribution was 3 since fat around basivertebral veins was replaced. Lumbar
bone marrow burden (BMB) score was thus 7.
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Fig. 1B Pretreatment MR images in 44-year-old woman with newly
diagnosed Gaucher's disease. Sagittal T1-weighted (A) and T2-weighted
(B) images of lumbar spine show bone marrow of lower signal intensity
than disk and presacral fat. Score for signal intensity was 4 and for
distribution was 3 since fat around basivertebral veins was replaced. Lumbar
bone marrow burden (BMB) score was thus 7.
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Fig. 1C Pretreatment MR images in 44-year-old woman with newly
diagnosed Gaucher's disease. Coronal T1-weighted (C) and T2-weighted
(D) images of femurs were scored 5 for signal intensity and 3 for
extent of involvement because of infiltration of epiphyses around knee, giving
total femoral BMB score of 8. Note shortening of right femur because of
previous infarction and collapse of right femoral head (more readily seen in
Fig. 2A,
2B,
2C,
2D).
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Fig. 1D Pretreatment MR images in 44-year-old woman with newly
diagnosed Gaucher's disease. Coronal T1-weighted (C) and T2-weighted
(D) images of femurs were scored 5 for signal intensity and 3 for
extent of involvement because of infiltration of epiphyses around knee, giving
total femoral BMB score of 8. Note shortening of right femur because of
previous infarction and collapse of right femoral head (more readily seen in
Fig. 2A,
2B,
2C,
2D).
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Fig. 2A Images of same woman with Gaucher's disease shown in Figure
1A,
1B,
1C,
1D obtained 2.5 years later,
after she had undergone 20 months of enzyme replacement therapy. Sagittal
T1-weighted (A) and T2-weighted (B) images of spine show
considerable return of signal to marrow so that signal intensity score is now
1 and distribution score 3, giving lumbar bone marrow burden (BMB) score of
4.
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Fig. 2B Images of same woman with Gaucher's disease shown in Figure
1A,
1B,
1C,
1D obtained 2.5 years later,
after she had undergone 20 months of enzyme replacement therapy. Sagittal
T1-weighted (A) and T2-weighted (B) images of spine show
considerable return of signal to marrow so that signal intensity score is now
1 and distribution score 3, giving lumbar bone marrow burden (BMB) score of
4.
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Fig. 2C Images of same woman with Gaucher's disease shown in Figure
1A,
1B,
1C,
1D obtained 2.5 years later,
after she had undergone 20 months of enzyme replacement therapy. Coronal
T1-weighted (C) and STIR (D) images of femurs show return of
signal to femoral epiphyses but because of persisting heterogeneous pattern
and residual T2 signal intensity score remained 5 with distribution score of
1, giving overall femoral BMB score of 6.
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Fig. 2D Images of same woman with Gaucher's disease shown in Figure
1A,
1B,
1C,
1D obtained 2.5 years later,
after she had undergone 20 months of enzyme replacement therapy. Coronal
T1-weighted (C) and STIR (D) images of femurs show return of
signal to femoral epiphyses but because of persisting heterogeneous pattern
and residual T2 signal intensity score remained 5 with distribution score of
1, giving overall femoral BMB score of 6.
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Fig. 3A Images of same woman with Gaucher's disease shown in Figures
1A,
1B,
1C,
1D and
2A,
2B,
2C,
2D obtained 4 years after
commencement of enzyme replacement therapy. Signal intensity on sagittal
T1-weighted (A) and T2-weighted (B) images of spine is now
normal giving lumbar bone marrow burden (BMB) score of 0.
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Fig. 3B Images of same woman with Gaucher's disease shown in Figures
1A,
1B,
1C,
1D and
2A,
2B,
2C,
2D obtained 4 years after
commencement of enzyme replacement therapy. Signal intensity on sagittal
T1-weighted (A) and T2-weighted (B) images of spine is now
normal giving lumbar bone marrow burden (BMB) score of 0.
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Fig. 3C Images of same woman with Gaucher's disease shown in Figures
1A,
1B,
1C,
1D and
2A,
2B,
2C,
2D obtained 4 years after
commencement of enzyme replacement therapy. Coronal T1-weighted (C) and
STIR (D) images of femurs where signal intensity in marrow is now
closer to normal in areas not affected by infarction or fibrosis so that
signal intensity score is 2 and distribution score 1, giving femoral BMB score
of 3.
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Fig. 3D Images of same woman with Gaucher's disease shown in Figures
1A,
1B,
1C,
1D and
2A,
2B,
2C,
2D obtained 4 years after
commencement of enzyme replacement therapy. Coronal T1-weighted (C) and
STIR (D) images of femurs where signal intensity in marrow is now
closer to normal in areas not affected by infarction or fibrosis so that
signal intensity score is 2 and distribution score 1, giving femoral BMB score
of 3.
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Copyright © 2007 by the American Roentgen Ray Society.