What was the approximate size of the incarcerated umbilical hernia defect?

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Measuring the fascial defect at the umbilicus is the key point here. An incarcerated hernia means the contents are trapped through a relatively small opening, often just a few millimeters to a couple of centimeters across. In this case, the defect was about one and a half centimeters in size. That size sits in the typical range for a small to moderate umbilical defect and often allows for primary closure without mesh if tissues are healthy. A much smaller opening (around 0.5 cm) would be less characteristic of an incarcerated case, while a larger defect (around 2.0 cm) would suggest a bigger opening that might prompt consideration of mesh repair. So the approximate size being around 1.5 cm best fits the scenario.