15th February 2025

You are assessing Jackie, a 20-year-old woman.

You are assessing Jackie, a 20-year-old woman. An ambulance was called for Jackie by her sister after Jackie locked her out of their shared flat. Her sister says Jackie has been acting increasingly “bizarrely” for several weeks. Upon further questioning, Jackie states that she believes that her sister has been replaced by someone trying to harm her, although she is unable to give further details. What is Jackie’s likely diagnosis?

Select the SINGLE most appropriate option from the list below. Select ONE option only.