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Stages of esophageal achalasia.
| Stages | Description |
|---|---|
| stage 0 | esophageal width of 4 cm or less |
| stage I | esophageal width of between 4 and 6 cm |
| stage II | esophageal width of greater than 6 cm |
| stage III | marked dilation of the distal esophagus >10 cm in diameter, tortuous course, angulation ± axis deviation |
