Navigating the Mysteries of CLIPPERS Syndrome: A Case Report of Long-Term Follow-Up.

Chronic lymphocytic inflammation with pontine perivascular enhancement responsive to steroids (CLIPPERS) syndrome is a rare central nervous system inflammatory disorder with an unknown pathophysiology. We present the case of a 51-year-old female exhibiting clinical and radiological features consistent with CLIPPERS syndrome. She manifested diplopia, vertigo, gait ataxia, and lower limb asthenia, accompanied by impaired tandem gait, right sixth nerve palsy, and coarse horizontal nystagmus during the physical examination. Magnetic resonance imaging (MRI) revealed punctate and curvilinear lesions centered in the pons. Treatment with glucocorticoids resulted in significant clinical improvement, and the patient was discharged with a maintenance dose of prednisolone. Throughout a four-year follow-up period, the patient remained symptom-free without any relapses using the low-dose corticosteroid. The CLIPPERS syndrome diagnosis remains challenging, but recent evidence supports an autoimmune pathogenesis. Although corticosteroid treatment has shown significant clinical improvement, there are no established guidelines or clinical trials on the optimal therapeutic regimen. Despite its rarity, clinicians should consider CLIPPERS syndrome in patients with compatible clinical and radiological features to prevent irreversible neurological damage.