Review Question - QID 212801

A 36-year-old woman is brought to the emergency room for altered mental status and rapid twitching of her left hand 3 hours ago. The patient is a poor historian given her current mental status, and her husband provided most of the history. He reports that the patient started demonstrating bizarre behavior about 2 weeks ago. She would be up until late into the night working on a “genius project” she had and had elaborate plans to double their joint investments. This morning, she began having speech difficulties, and her left hand jerked uncontrollably for the 10 minutes. He denies loss of consciousness, urinary incontinence, vision changes, or sick contacts. Her past medical history is significant for an adequately treated syphilis infection 10 years ago. Her temperature is 101°F (38.3°C), blood pressure is 118/70 mmHg, pulse is 103/min, respirations are 18/min, and oxygen saturation is 99% on room air. A physical examination demonstrates a lethargic individual with neck stiffness. A computed tomography of the head is unremarkable, and a cerebral spinal fluid (CSF) study is shown below.

Cell count: 760/mm3
Cell type: Lymphocytes
Glucose: 60 mg/dL
Pressure: 100 mmH2O
Proteins: 35 mg/dL
Erythrocytes: 130/mm^3

What is the most likely explanation for this patient’s symptoms?