Rania al-Baz said her husband, Mohammed al-Fallatta, beat her so hard earlier this week that he broke her nose and fractured her face in 13 places.
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Ms Baz's mother told Saudi media that Mr Fallatta beat her daughter regularly.
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The presence of problems such as domestic violence, rape, paedophilia or Aids is often simply not acknowledged our correspondent adds.
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'Husband's right'
"It is considered a husband's rights that his wife should obey him," Abeer Mishkhas, of the Saudi English-language newspaper Arab News, told BBC News Online.
"This can involve coercion or violence, and we know that the majority of cases of this kind go unreported and unnoticed."
More and more Saudi women go to civil courts to request divorces on grounds of violence, Ms Mishkhas says.
But they are still not allowed to vote, drive, own a business or travel without permission from a male guardian.