MSFinals-5523
A 78-year-old man comes to see you, struggling to cope after his wife passed away suddenly 5 months ago. He appears sad and spends most of the appointment looking down, but answers your questions. He expresses concern that he may be losing his mind because he has started seeing his wife sitting in her old chair and sometimes talks to her when he is alone. He confirms that he can hear her voice responding to him. He says he mostly talks to her while cooking in the kitchen or when he is alone at night. Despite these experiences, he knows that what he sees and hears is not real. He reports occasional memory loss and some abdominal pain due to his irritable bowel syndrome, but is otherwise healthy. He has no history of psychiatric conditions in himself or his family. What is the most likely diagnosis?