Thyroid Nodule Aspect Ratio Calculator

How to Use This Calculator

1. Enter the longest diameter of the thyroid nodule in millimeters.
2. Enter the shortest diameter of the thyroid nodule in millimeters.
3. Click the "Calculate" button to determine the aspect ratio.
4. Review the calculated aspect ratio and interpretation.

Understanding Aspect Ratio in Thyroid Nodules

The aspect ratio is calculated by dividing the longest diameter by the shortest diameter of a thyroid nodule. This measurement helps in assessing the shape of the nodule:

• Round nodules: Aspect ratio less than 1 (closer to a circle)
• Slightly elongated nodules: Aspect ratio between 1 and 1.5
• Significantly elongated nodules: Aspect ratio greater than 1.5

Elongated nodules (higher aspect ratio) are more likely to be malignant, while round nodules are more likely to be benign. However, this is just one of many factors used in thyroid nodule assessment.

Limitations and Important Notes

The aspect ratio alone cannot diagnose thyroid conditions. It should be interpreted alongside other ultrasound features:

• Margin characteristics (smooth or irregular)
• Homogeneity of the nodule
• Presence of microcalcifications
• Hypervascularity

For accurate diagnosis, consult with a healthcare professional who can interpret the results in the context of your medical history and other clinical findings.