Choledochal Cyst Todani Classification Calculator

Classify choledochal cysts using Todani modification of Alonso-Lej system. Types I–V based on location and morphology. Type I (fusiform CBD dilation) most common (80–90%). Type IV/V have highest malignancy risk.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Classify choledochal cysts using Todani modification of Alonso-Lej system. Types I–V based on location and morphology. Type I (fusiform CBD dilation) most common (80–90%). Type IV/V have highest malignancy risk

Each component has a specific meaning:

  • Todani modification of Alonso-Lej system — The todani modification of alonso-lej system recorded for the scenario being assessed.

Note: Interpret the choledochal cyst type result against the thresholds and context described above.

How to Use

Enter the Todani modification of Alonso-Lej system for the scenario you are assessing. Classify choledochal cysts using Todani modification of Alonso-Lej system. Types I–V based on location and morphology. Type I (fusiform CBD dilation) most common (80–90%). Type IV/V have highest malignancy risk. Use the choledochal cyst type result to inform your calculation.

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