The present dissertation aims to present the concept of primary narcissism in the works of Freud, Lacan and André Green, in order to investigate the relation between the formation of the ego and the new symptomatologies, understood as borderline cases. Lacan and Green articulate narcissism to the second Freudian topic, pointing to the structuring of a primordial form, a first separation between the internal and external worlds, as a condition of emergence for a more complex Ego. In the mirror stage, Lacan proposes the construction of a symbolic matrix from a dialectic of imaginary identifications. Green, in turn, inserts the relation between pulsion and object in primary narcissism as the conjuncture that forms a framing structure. In this sense, we intend to approximate the notions of symbolic matrix and framing structure due to our intuition that these primary forms would be spaces in which the Ego arises. These spaces would not be well structured in the borderline cases.