The Case: 55-year-old woman presented to the ED with two days of worsening bilateral leg pain, stiffness, and swelling. She first noticed a change two nights prior when she woke up to use the restroom and found she had some difficulty moving her legs. She noticed increased difficulty walking since that period. She denied any trauma, IVDU, or anticoagulant use. Prior to the onset of her symptoms, she routinely walked two to three miles each day.