Conventional MR imaging features of ameloblastomas and keratocystic odontogenic tumors
| MR Imaging Features | Ameloblastomas | Keratocystic Odontogenic Tumors | |
|---|---|---|---|
| n | 9 | 7 | |
| Maxilla/mandible | 1/8 | 0/7 | |
| Size (L × S × H, cm), mean (± SD) | 3.6 (1.2) × 2.3 (0.6) × 3.8 (0.9) | 2.8 (0.5) × 1.4 (0.7) × 3.3 (1.2) | |
| Tumor with solid wall | 9 | 0 | |
| Signal intensity on T1/fsT2WI | Solid Lesion | Nonenhancing Lesion | Nonenhancing Lesion |
| Low/high | 0 | 7 | 1 |
| Intermediate/high | 0 | 2 | 1 |
| Low/intermediate | 4 | 0 | 1 |
| Intermediate/intermediate | 5 | 0 | 4 |
Note:—T1/fsT2WI indicates T1/fat-suppressed T2-weighted images; L × S × H, average long axes (on axial T1WI) × short axes (on axial T1WI) × heights (on coronal T1WI). Solid and nonenhancing lesions indicate tumor areas with and without contrast enhancement, respectively. Bold figures indicate type A nonenhancing lesion with high-intensity signals on fsT2WI.