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| Clinical |
| C0—no clinical signs |
| C1—small varicose veins |
| C2—large varicose veins |
| C3—edema |
| C4—skin changes without ulceration |
| C5—skin changes with healed ulceration |
| C6—skin changes with active ulceration |
| Etiology |
| EC—congenital |
| EP—primary |
| ES—secondary (usually due to DVT history) |
| Anatomy |
| AS—superficial veins |
| AD—deep veins |
| AP—perforating veins |
| Pathophysiology |
| PR—reflux |
| PO—obstruction |
CEAP, Clinical, Etiologic, Anatomic, and Pathophysiologic.
