In the given case, we need to identify the type of disorder the patient might be suffering from based on the symptoms described. The patient experienced a Road Traffic Accident (RTA) two months ago and is now having distressful dreams about the accident. Furthermore, he relives the incident vividly when visiting the accident site and avoids going there due to fear. These symptoms align with one particular disorder.
Let's analyze the potential disorders provided in the options:
- Adjustment Disorder: Typically involves emotional or behavioral symptoms in response to a specific stressor or change, but does not generally involve reliving incidents or avoidance based on fear tied to past traumatic events.
- PTSD (Post-Traumatic Stress Disorder): Characterized by re-experiencing a traumatic event (such as vivid dreams or flashbacks), avoidance of places related to the trauma, and heightened anxiety. These symptoms match the patient's experiences perfectly.
- Anxiety Disorder: While it involves excessive worry and fear, it does not specifically include reliving a specific traumatic event or avoiding places associated with such events.
- OCD (Obsessive-Compulsive Disorder): Involves unwanted repetitive thoughts or compulsion to perform certain actions and does not fit the pattern of re-experiencing a traumatic event.
Based on the detailed symptomatology presented, the most appropriate diagnosis for this patient is PTSD (Post-Traumatic Stress Disorder).