IgLON5-mediated neurodegeneration is a differential diagnosis of CNS Whipple disease

A 49-year-old man developed cold intolerance as an isolated symptom 2 years prior to presentation. At age 48, he developed jerks in the trunk and lower limbs during the day and tapping movements in the arms during sleep. After 6 months, sleep disturbance worsened with talking and gesticulations, culminating in sleeping 1–3 hours per night with associated daytime somnolence. He developed mild slurred speech, hypersalivation, and dysphagia. He reported poor memory but was able to continue driving and working. He had been diagnosed with obstructive sleep apnea 4 years prior.

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