The document provides a case analysis evaluation for a 59-year-old male patient, Andrew, presenting with symptoms of depressed mood, irritability, anger outbursts, and intrusive thoughts about his past combat experience in Vietnam. The case analysis includes: 1) a differential diagnosis of PTSD, generalized anxiety disorder, paranoid personality disorder, and adjustment disorder; 2) descriptions of mental status exam findings and etiology for each diagnosis; and 3) recommendations for diagnostic screening tools, a final assessment of PTSD, and a treatment plan focusing on pharmacological and psychological therapies.