The Ganser syndrome has been evolving more in terms of the nosological conception than in relation to its clinic characteristics, with the hypothesis of a hysterical etipopathogenesis in conflict with the psychotic etiopathogenesis, the malingering, and the factitious disorders, adding the possibility of predisposing organic damage underneath.

In DSM-III, it was considered as a factitious disorder with psychotic symptoms, and since the DSM-III-R it is included as a Dissociative Disorder NOS.

We show in a table similarities and differences between Ganser Syndrome and factitious and malingering disorders, the disorders most commonly mistaken with Ganser Syndrome.