Alright, from what you're telling me. (And trust me, I love neuroscience).
This patient most likely has a lesion/damage to his Brocha's or Wernicke's area. A neurological examination will have to be conducted in order to determine which one, test his language comprehension in order to rule out Wernicke's. If you're looking for a more general diagnosis, I'd roughly call it the Temporal lobe.
