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23 yrs old, medical student, headache and intermittent fever 2 weeks…

- - - - Bacterial (septic)
        
        Chronic
      - Viral (aseptic)
      - Fungal or parasitic
    - - Brain Abscess
      - If immuno-compromised or high HIV-risk consider:
        Toxoplasmosis
        Cryptococcosis
        Aspergilosis
        Nocardiosis
        Tuberculosis
        HHV-6
        Primary cerebral lymphoma
        AIDS encephalopathy
      - Viral Encephalitis
  - - - Viral infection:
        Dengue, Zika
    - - Pharyngitis
      - Sinusitis
      - Otitis Media
      - Osteomyelitis of skull
      - Tonsilitis
    - - Pneumonia
      - Bacterial Enteritis
      - Pyelonephritis
      - Cellulitis
      - Bacterial Endocarditis
- - - - Primary
      - Metastatic
    - - Cerebral Venous Sinus Thrombosis:
        Headache, seizure, vomitting, cranial nerve palsy especially CN 3,4,6 and V1,V2
    - - Subdural Hemorrhage:
        Initial concussion with lucid interval
        Drowsiness
  - - - Autoimmune
        
        Temporal Arteritis:
        Throbbing Headache localised to temporal
        Temporal artery tender to palpation
        Intermittent visual loss and Jaw claudication
        Less likely as >50 years old
        Elevated ESR