**Refining Content Structure** I'm now deeply immersed in the content. I've drafted the introduction, designed to capture attention and set the scene. I am expanding on the key findings, including correlations, and the clinical implications. I am paying close attention to the structural integrity to ensure it adheres to professional standards and the tone of the target audience. A landmark study reveals that skull bone marrow inflammation, measured via TSPO PET imaging, is significantly elevated in secondary progressive multiple sclerosis and correlates with clinical disability, suggesting a new paradigm for monitoring disease progression beyond traditional neuroimaging.