S-MRI score: A simple method for assessing bone marrow involvement in Gaucher disease

Area of Science:

• Radiology
• Medical Imaging
• Bone Diseases

Background:

• Gaucher disease (GD) is a rare genetic disorder affecting bone marrow.
• Semi-quantitative Magnetic Resonance Imaging (MRI) is crucial for assessing bone marrow burden (BMB) in GD.
• Existing scoring systems aim to quantify bone disease severity.

Purpose of the Study:

• To develop and validate a simple, reproducible, and accurate MRI-based scoring system for evaluating bone marrow involvement in Gaucher disease patients.
• To compare the novel score's performance against established bone marrow burden (BMB) assessments.

Main Methods:

• A novel scoring system, Spanish-MRI (S-MRI), was developed using MRI data from 54 adult GD1 patients.
• MRI evaluated the spine, pelvis, and femora, categorizing infiltration patterns (normal to homogeneous infiltration).
• Two independent observers applied the S-MRI score, with results correlated against BMB scores and CT activity.

Main Results:

• Bone involvement was observed in 85.2% of patients, with spine, pelvis, and femora frequently affected.
• The S-MRI score demonstrated a strong correlation with the bone marrow burden (BMB) score (r²=0.675; p=.0001).
• S-MRI showed higher sensitivity, specificity, and accuracy than BMB for classifying bone disease extent and identified silent complications.

Conclusions:

• The Spanish-MRI (S-MRI) score is a simple, accurate, and reproducible method for assessing bone marrow infiltration in Gaucher disease.
• S-MRI provides valuable information for evaluating disease extent and detecting subclinical bone complications.
• The study found correlations between genotype and bone infiltration patterns/complications using the S-MRI score.