What is THAT on your liver?

A 44 year-old female with a past medical history of hypothyroidism and obesity presents with acute onset right upper quadrant abdominal pain radiating to the back and sternum. Associated symptoms include nausea and lightheadedness with standing. Her medications include Levothyroxine and an oral contraceptive pill (OCP).

Lab work-up reveals total bilirubin 0.2 mg/dL, alkaline phosphatase 150 U/L, ALT 113 U/L, AST 104 U/L, INR 0.9, WBC 14.3 K/uL, hemoglobin 9.3 g/dL, platelet count 488, Lactate 4.5 mmol/L.

On physical exam hepatomegaly is palpable and she is significantly tender to palpation in the epigastrium and right upper quadrant.

What is the next best step?