Anatomy Question of the Day

A 47-year old woman is brought by ambulance to the trauma bay after being involved in a high-speed motor vehicle collision. She is unresponsive, with a blood pressure of 78/42 and pulse 132. She is immediately intubated and breath sounds are confirmed. Her heart sounds are normal and peripheral pulses are intact. There is no obvious bleeding and two large bore IVs are started. Abdominal ultrasound reveals a fluid collection in the left upper quadrant. She continues to deteriorate and is brought emergently to the OR for exploratory laparotomy, where packing of the abdomen reveals extensive bleeding in the left upper quadrant. What do you expect is the cause of this bleeding?