Case 1: "A 42-year-old male presents with alteration of consciousness for 1 hour"
Case 2: "A 64-year-old male presents with chronic progressive low back pain for 1 year"
Case 3: "A 61-year-old male presents with dyspnea for 1 month"
Case 4: "A 59-year-old male presents with acute fever and symmetrical polyarthritis for 10 days"