Rule of 2s in Meckel diverticulum

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The rule of 2s is a useful mnemonic for the features of Meckel diverticulum, although the figures do have a broad range:

  • occur in 2% of the population
  • are 2 inches (5 cm) long
  • are 2 feet (60 cm) from the ileocecal valve
  • 2/3 have ectopic mucosa
  • 2 types of ectopic tissue are commonly present (mostly gastric and pancreatic) 
  • 2% become symptomatic