## Anatomical Level of Renal Hilum **Key Point:** The hilum of the left kidney is located at the level of **L1 vertebra**, while the right kidney hilum is typically at L2 due to the presence of the liver superiorly displacing the right kidney inferiorly. ### Vertebral Level Relations | Structure | Left Side | Right Side | Reason | | --- | --- | --- | --- | | Upper pole of kidney | T12 | T12 | Both kidneys extend superiorly to this level | | Hilum of kidney | **L1** | L2 | Right kidney displaced inferiorly by liver | | Lower pole of kidney | L3 | L3–L4 | Right kidney extends slightly lower due to hepatic displacement | **High-Yield:** According to standard anatomical references (Gray's Anatomy, Snell's Clinical Anatomy), the hilum of the left kidney lies at the level of the **L1 vertebra** (transpyloric plane), and the right kidney hilum is at approximately L2. The right kidney is displaced inferiorly by the large right lobe of the liver. **Clinical Pearl:** The transpyloric plane (L1) is a key anatomical landmark — it passes through the hilum of the left kidney, the pylorus of the stomach, the neck of the pancreas, the duodenojejunal flexure, and the fundus of the gallbladder. This makes L1 a high-yield level for multiple structures. **Mnemonic:** "Left hilum = L1" — the left kidney hilum aligns with the transpyloric plane at L1, one level higher than the right (L2). 
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