Frequency per year | Average age | Sex | Laterality | Affected side | |
Matsuda et al. series | 22 patients/year | 50 years | Female: 60% Male: 40% | Bilateral: 67% Unilateral: 33% | Right: 50.2% Left: 49.8% |
Robert and Dennis series | 19 patients/year | 36 years | Female: 51% Male: 48% | Bilateral: 68% Unilateral: 32% | Right: 48.3% Left: 51.7% |
Our series | 4 patients/year | 22 years | Female: 58.1% Male: 41.9% | Unilateral: 100% | Right: 75% Left: 25% |