The Haller Index is a key measurement used on chest CT to assess the severity of pectus excavatum.
📏 Formula:
Haller Index = Transverse Diameter ÷ AP Distance
• Transverse diameter → widest internal chest width
• AP distance → shortest distance between sternum and vertebra
📊 Interpretation:
✔ Normal: < 2.0
⚠ Mild–Moderate: 2.0 – 3.2
❗ Severe: > 3.5
🔎 Surgical consideration:
👉 Haller Index ≥ 3.25
Clean measurement. Clear decision-making. Better outcomes.