A 39-year-old woman (gravida 2, para 0) presented to her obstetrician at 32 weeks' gestation with a 2-day history of low back pain. The pain was abrupt in onset and constant. She reported no fever, chills, dysuria, urinary frequency, vaginal discharge or bleeding, or other associated symptoms. Preterm labor was ruled out, and she was advised to rest and take acetaminophen as needed.
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