Calot triangle

Calot triangle is a small (potential) triangular space at the porta hepatis of surgical importance as it is dissected during cholecystectomy. Its contents, the cystic artery and cystic duct must be identified before ligation and division to avoid damaging them during the operation.

Gross anatomy

Boundaries

The (isosceles) triangle is positioned so that the apex points towards the liver with the boundaries:

  • right: the cystic duct which is often tortuous and has a beaded appearance, passes downward and to the left to join the common duct
  • left: common hepatic duct
  • superior: the inferior surface of the liver (in the original description by Calot the cystic artery is defined as the superior margin)
Contents

History and etymology

This space was first described by the French surgeon, Jean-François Calot (1861–1944) 3 in 1891, as part of his PhD thesis; although the space as described by Calot differs slightly from the modern description 4

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Article information

rID: 40294
Section: Anatomy
Synonyms or Alternate Spellings:
  • Triangle of Calot
  • Hepatocystic triangle
  • Calot's triangle

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