Researchers using PET/CT reported at a radiology conference that they have found physiological evidence that "chemo brain," a phenomenon resulting from chemotherapy that is characterized by memory problems and mental haziness, is a real medical condition. Researchers said they have observed reduced metabolism in brain areas that play a role in problem solving, tracking daily events, sequencing and remembering things in the long term. The scan results also showed the condition was temporary, with normal metabolism resuming in affected brain areas after some time, researchers said.