Mystery Case: A 78-year-old man with a gait disorder

A 78-year-old right-handed man was admitted to our department with a gait disorder that had begun 45 days ago. He had a history of alcohol and tobacco use, moderate chronic obstructive pulmonary disease, follicular non-Hodgkin lymphoma without treatment, lung adenocarcinoma in complete remission, and psoriasis. His gait disorder had evolved progressively.