A 72-year-old female presented to A&E with a sudden-onset occipital headache 3 hours ago
A 72-year-old female presented to A&E with a sudden-onset occipital headache 3 hours ago. She has a history of previous stroke with residual left-sided arm weakness and type 2 diabetes. On a neurological exam her left-sided arm weakness is evident. There are no cranial nerve abnormalities. Blood tests show:
| Hb 166 (115-160) | Plts 455 (150-400) | CRP 2 (<5) | K⁺ 3.8 (3.5-5) |
| WBC 10.9 (4-11) | Haematocrit 0.51 (0.37-0.45) | Na⁺ 134 (135-145) | Creatinine 92 (45-84) |
CT head is normal. A lumbar puncture is performed 12 hours after the onset of headache:
| CSF culture: negative | CSF xanthochromia: negative | CSF RBC: 500 x 10⁶/L (<5) | CSF WBC/mm³: 15, predominantly lymphocytes (<5) |
What is the most likely underlying diagnosis?
Select the SINGLE most appropriate option from the list below. Select ONE option only.
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