Type II Modic Changes May not Always Represent Fat Degeneration: A Study Using MR Fat Suppression Sequence.

Area of Science:

• Radiology
• Spinal Imaging
• Magnetic Resonance Imaging (MRI)

Background:

• Type II Modic changes (MCs) are common vertebral endplate signal alterations observed on MRI.
• Histological data suggest type II MCs represent stable fat degeneration.
• Fat suppression (FS) MRI techniques can quantify fat content, offering a potential method to investigate MC pathology.

Purpose of the Study:

• To characterize type II MCs using fat suppression (FS) magnetic resonance (MR) imaging.
• To assess the association between type II MCs and radiological disc degeneration.

Main Methods:

• Retrospective review of lumbar MR images with type II MCs and FS sequences.
• Visual classification of type II MC signal suppression on FS images.
• Quantitative measurement of signal intensity, fat content index, MC size, and adjacent disc degeneration.
• Statistical analysis using paired t-tests and logistic regression.

Main Results:

• Out of 150 type II MCs studied, 75.3% did not show signal suppression on FS images.
• Discs adjacent to type II MCs exhibited lower signal intensity, reduced disc height, and increased bulging compared to controls.
• Non-suppressed type II MCs were associated with older age, lower patient height, and greater posterior disc bulging.

Conclusions:

• The majority of type II MCs do not suppress on FS MR images, suggesting complex and ongoing pathological processes.
• Type II MCs likely represent more than just simple fat replacement in the vertebral endplate.