A Norwegian medical student posed as a qualified doctor for two years in a small Swedish town and got top marks from senior doctors and his patients after the case was uncovered.

"We have studied his journals to check on the patients. He was not a bad doctor," said Leif Spangen, former chief surgeon at a hospital near the town of Torsby where the 34-year-old man had more than 1,200 patients.

"Yes, he performed minor surgery such as surgery on skin abnormalities, nail infections and simple extractions," Dr Spangen, who is reviewing the case, told Reuters.