Review Question - QID 109620

A 34-year-old G3P3 woman with a history of migraines presents with several weeks of headaches. The headaches are unlike her usual migraines and are worse in the morning. This morning she had an episode of emesis prompting her to seek medical care. She also has some right sided weakness which she believes is related to a new exercise routine. Her mother is a breast cancer survivor. Her medications include oral contraceptives and ibuprofen as needed, which has not helped her current headaches. She drinks 2-3 alcoholic drinks on the weekends and does not smoke. Physical examination is remarkable for bilateral papilledema. Motor exam is notable for upper and lower extremity strength 4/5 on the right and 5/5 on the left. Magnetic resonance venography demonstrates absent flow in the left venous sinuses. Which of the following predisposed this patient to her current condition?