Here is a brief, factual summary of the article in Slovak: Magnetic tattooing and some cosmetic products pose hidden risks during magnetic resonance imaging (MRI). Researchers warn that these materials can cause burns or other complications during an MRI scan. There have been documented cases of patients with magnetic tattoos or cosmetic products suffering burns during MRI. Therefore, experts recommend that patients inform doctors about any permanent cosmetic modifications before an MRI examination to avoid possible risks.