Synonyms: Addison’s plane
Definition: An imaginary horizontal line (halfway between suprasternal notch and pubic symphysis) through the L1 vertebra, a line that is important when performing radiographic imaging studies.
Structures lying in transpyloric plane:
Mnemonic: TRANSPYLORIC
- Termination of spinal cord
- Renal hilum – Left only
- Transpyloric plane (L1) goes through only 1 hilum, i.e. Left
- Right kidney is 2.5 cm lower than left
- Artery – superior mesenteric artery (SMA)
- Ninth rib
- S:
- Splenic flexure of colon
- Splenic hilum
- Second part of duodenum
- P:
- Pylorus of stomach
- Portal vein origin
- Pancreatic neck
- Y: Nothing
- L:
- L1 vertebral body
- Liver (hepatic flexure of colon)
- O: Oddi (sphincter of oddi)
- R: Root of transverse mesocolon
- I: Ignore
- C: Cysterna chyli
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