A 72-year-old female presented to A&E with a sudden-onset occipital headache 3 hours ago | Medibuddy
13th August 2024

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?

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