A 28-year-old, socially well-integrated woman without psychiatric antecedents, was admitted in restraint to our psychiatric ward, after presenting herself at a police station clad only in an overcoat and unable to give her identity. She presented with spatiotemporal disorientation, muddled thinking, mental automaticity, vivid delirium of polymorphic content, and hetero-aggressivity. Somatic and neurological examination results were unexceptional, and the biological analysis results showed leuconeutropenia and a high sedimentation time. Serological tests for syphilis, HIV, HVB, and HVC were negative, and a brain scan and EEG showed no anomalies. A nonspecified psychotic state was diagnosed, and an antipsychotic treatment combining risperidone and loxapine was given.