Prenatal diagnosis is very important in the context of pregnancy control. Among other things, it makes it possible to detect one of the most common malformations of the foetus, namely congenital malformations of the central nervous system such as malformations of the brain and spinal cord. The basic diagnostic test is the Medical US examination, through which it is possible to detect abnormalities in the development of the foetus. In order to make a full and more accurate diagnosis, it is useful to use MR (magnetic resonance imaging), which reveals many details that allow the diagnosis to be made more precise.