The case reported demonstrates, to a greater or lesser degree, practically all the symptomatology reported in the literature of

depersonalization. Genetically and dynamically noteworthy are: 1, fixation at a pregenital (especially oral sadistic) phase of development; 2, relationships among the family (father, mother, brother) were overtly sadomasochistic; 3, a series of severe infantile and subsequent psychological traumata; 4, distorted (body) ego development. The case is discussed particularly from the point of view of body ego pathology. Body ego disturbances, especially of genital representations, may be of basic importance in the psychogenesis of depersonalization. A suggestion was made as to the possible normal mode of development of the body ego.