Was Al Capone delusional?

When Al Capone was let out of Alcatraz federal penitentiary he was suffering from the late tertiary effects of syphilis. From Alcatraz he went to a hospital in Baltimore. In The last years of Capone's life he was continuing the treatment for the disease. According to biographers, he had a diminished capacity of mental and brain functions. This is considered because Capone behaved like he was crazy, or that he had lost his mind. He was talking to himself, crying, and complaining about ghosts bothering him. Finally dying of pneumonia and a stroke on January 25, 1947. I am interested in the last years of Capone's life, when the disease in his brain starts to complicate his life. He was often seen complaining about ghosts bothering him. Is this the part of the delusional affects of the disease? The treatment for syphilis in those days was clinical. There were no advance treatment for the disease, or even a cure. Is it possible that he had an on going paranormal event that had been threatening his life? And that maybe these ghosts were not figments of his imagination.