Review Question - QID 217133

A 57-year-old man is brought to a neurologist by his wife for abnormal behavior. He was normal until around 3 months ago when he started forgetting important meetings and misplacing items around the house. One month ago, the patient was fired from his job as a software engineer after attempting to grope a coworker. The patient expresses frustration that he is no longer able to concentrate enough to enjoy his hobby of solving puzzles. His medical history is significant for gastroesophageal reflux disease for which he takes omeprazole. He has no family history of neurologic disease. His temperature is 98.6°F (37.0°C), blood pressure is 120/75 mmHg, pulse is 70/min, and respirations are 16/min. During the examination, the patient’s cell phone rings unexpectedly causing the patient to suddenly jerk his arms and legs. Further diagnostic investigation is performed which reveals an elevated 14-3-3 protein on cerebrospinal fluid analysis. Which of the following is the most likely diagnosis?