A team of Canadian surgeons got a shock when the patient they were operating on began shedding dark greenish-black blood, the Lancet reports.
The 42-year-old man was not a Vulcan relative of Mr Spock of the starship Enterprise.
Instead, the unusual colour of his blood was down to the migraine medication he was taking.
The man's leg surgery went ahead successfully and his blood returned to normal once he eased off the drug.
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Patient bleeds dark green blood
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