system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
The structure that does not cross the midline is -
assistant
The correct answer is  In the left side, inferior phrenic vein, suprarenal vein, and the gonadal vein drains into left renal vein, whereas on the right side, they drain into inferior vena cava directly. So they do not cross the midline on the left side.