A Case Report: The CSF Characteristics of HaNDL Syndrome.

Background: Headache and Neurologic Deficits with cerebrospinal fluid Lymphocytosis (HaNDL) is a rare and underdiagnosed syndrome that mimics recurrent stroke, migraine with aura, and encephalitis.

Objective: Describe the presentation, clinical characteristics, and cerebrospinal fluid (CSF) findings in a patient with HaNDL and provide insight into the importance of the recognition of this syndrome.

Methods: The authors describe a unique case of (HaNDL) during which the patient underwent three lumbar punctures over 26 days.