Individuals suffering PTSD display symptoms that look like that of those suffering from trauma symptoms associated with the narcissistic personality (TANS).
This article by Simon (2002) sheds clear light on distinguishing between the 2 types of patients. The table below is an extract from the article:
If we were to extract the gist of the difference between PTSD and TANS, we may be able to summarize that unlike in PTSD, patients with TANS main “damage” is that of the grandiose image of the self. There is more shame and humiliation underlying. This is manifested by anxiety about damage to a kind of grandiose self image. In PTSD symptoms, the anxiety is mainly about survival.
Knowledge of these differences facilitate the psychotherapeutic treatment of the patients, since both types of patients experience the relationship with the therapist differently. This also reflects the difference between event onset trauma in the case of PTSD, and developmental attachment related trauma in the case of complex trauma.
Simon, R. I. (2002). Distinguishing trauma-associated narcissistic symptoms from posttraumatic stress disorder: A diagnostic challenge. Harvard Review of Psychiatry, 10(1), 28-36.