North Korea, one of the world’s most reclusive states, plans to branch out into medical tourism next year, offering foreign visitors, most likely from China, treatments including cataract surgery, dental implants and therapy for tumours. Private tourism is one of the few remaining areas of business not blocked by sanctions imposed on North Korea over its nuclear and missile programmes. As many as 350,000 Chinese tourists have visited North Korea this year, potentially netting the authorities up to $175 million, according to some analysts.