Neurological Involvement in Merkel Cell Carcinoma

<p>This clinical review examines the <strong>neurological complications</strong> associated with <strong>Merkel cell carcinoma (MCC)</strong>, distinguishing between <strong>immune-mediated paraneoplastic syndromes</strong> and <strong>direct metastatic involvement</strong>. The text highlights that <strong>Lambert–Eaton myasthenic syndrome (LEMS)</strong> is the most frequent paraneoplastic manifestation and often appears before the cancer is officially diagnosed. Diagnostic protocols emphasize the use of <strong>paired serum and CSF antibody testing</strong>, specifically looking for <strong>VGCC, anti-Hu, and neurofilament antibodies</strong> to identify underlying malignancy. Management of these conditions primarily focuses on <strong>oncologic control</strong>, utilizing <strong>immune checkpoint inhibitors</strong> and <strong>stereotactic radiosurgery</strong> to improve patient outcomes. The author stresses the importance of differentiating <strong>structural brain disease</strong> from autoimmune reactions, as the therapeutic strategies for each differ significantly. Ultimately, the source provides a <strong>comprehensive framework</strong> for clinicians to identify, stage, and treat the complex nervous system interactions of this rare skin cancer. </p><p><br></p><p>This episode is based on a paper written exclusively for the Weekly Neurology Deep Dive Podcast by Amer A. Ghavanini MD PhD FRCPC.</p>