[Genetic syndromology. Introduction to a series].

Syndromology belongs to diagnostic methods based on the analysis of phenotypic (clinical or anatomical--dysmorphics) features, which occur very often together and have a common etiology (e.g. teratogenic embryopathy, numerical and structural chromosomal aberrations or gene mutations). In the phenotype analysis important appear so-called signal features, which enable to narrow the range of possible disorders for the differential diagnosis of the assumptive diseases.