A 32-year-old woman presents seven days after an uncomplicated delivery with five sudden, severe headaches over 48 hours. Each begins abruptly during bathing or sexual activity and settles over about an hour; between episodes she is comfortable and neurologically normal. CT of the brain shows no haemorrhage, and CT angiography demonstrates multifocal segmental narrowing of several intracranial arteries without an aneurysm. Which one of the following is the most likely diagnosis?
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