[Differential diagnosis of pathological and anatomical variations of growth of the skull bones].

In radiologically demonstrated diseases of the skull bones, differential diagnosis has to be made with such anatomical developmental variations as pacchionian depressions, venous lacunae, emissaria, and macrocellular structure of the parietal tuber. Anatomical developmental variations were mistaken for other pathological processes in 47 (33.1%) of 130 patients. The principal features distinguishing anatomical developmental variations from defects of other genesis are communication with the venous network, typical localization, a great number of foci of diminished density as a rule, homogeneity of structures, regular shape and clearly demonstrated boundaries of the defects, and total absence of any clinical manifestations.