The circular staircase, or herringbone pattern, is a common radiographic sign for a mechanical ileus.

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The circular staircase or herringbone pattern is a commonly seen radiographic sign for a mechanical ileus, which is a blockage in the intestinal tract that is caused by a physical obstruction. This pattern is created by the accumulation of gas and stool in the dilated loops of bowel above the obstruction, which creates a twisting pattern that resembles a circular staircase or herringbone.

The Circular Staircase, or Herringbone Pattern, Is a Common Radiographic