People who had Covid lost an additional 1.8% of the parahippocampal gyrus, which is a key region of smell. They also lost an additional 0.8% of the cerebellum, which aids motor skills and balance, compared with control subjects.
Article source: https://www.huffingtonpost.co.uk/entry/how-catching-covid-affects-the-brain_uk_62272cf6e4b004e4e385687c