Frimann-Dahl sign

The Frimann-Dahl sign is a diagnostic sign demonstrated when three dense lines, representing the sigmoid walls, are seen converging to the site of obstruction in sigmoid volvulus and associated with empty rectal gas 1.

History and etymology

Johan Frimann-Dahl (1902-82) was a Norwegian Professor of Radiology, and Head of the Roentgen Department from 1937-1972, at Ullevål Hospital, Oslo, Norway 2.

Article information

rID: 40965
Section: Signs
Synonyms or Alternate Spellings:
  • Frimann-Dahl's sign

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Cases and figures

  • Case 1
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