Table 1.
Demographic patient characteristics with primary mediastinal cysts divided into three groups according to location
| Variables | Group I (N = 183) | Group II (N = 60) | Group III (N = 39) | F‐value | P‐value |
|---|---|---|---|---|---|
| Age (median, IQR) | 55 (49–62) | 41 (29–50) | 41 (30–51) | 48.201 | <0.001 |
| Sex (male/female) | 74/109 | 30/30 | 19/20 | 0.974 | 0.406 |
| Clinical symptom (%) | 45 (24.6%) | 24 (40.0%) | 9 (23.1%) | 0.466 | 0.706 |
| Symptom developed during observation (%) | 3 (1.6%) | 8 (13.3%) | 7 (17.9%) | 7.304 | <0.001 |
| Cyst size (mean ± SD, range) | 4.2 ± 3.0 (0.5–16.0) | 4.4 ± 2.8 (0.5–22.0) | 4.0 ± 1.6 (0.5–8.5) | 0.253 | 0.859 |
| Mean CT attenuation (mean ± SD, range) | 23.8 ± 14.2 (0–52.0) | 24.1 ± 16.3 (−8.0–60.0) | 35.5 ± 20.1 (0–67.0) | 5.356 | 0.001 |
| Diagnosed as mediastinal cyst by CT (%) | 98 (53.6%) | 27 (45.0%) | 18 (46.2%) | 0.885 | 0.449 |
| Pathology | 4.730 | 0.003 | |||
| Thymic cyst | 118 | 1 | 1 | ||
| Bronchogenic cyst | 48 | 41 | 31 | ||
| Pericardial cyst | 13 | 12 | 1 | ||
| Esophageal cyst | 1 | 3 | 3 | ||
| Pleural cyst | 2 | 1 | 0 | ||
| Lymphangioma cyst | 0 | 1 | 0 | ||
| Others | 1 | 1 | 3 |
Group I: Patients with anterior mediastinal cyst. Group II: Patients with middle mediastinal cyst. Group III: Patients with posterior mediastinal cyst. IQR, interquartile range; SD, standard deviation