Table 3.
Conventional MRI, T1 and T2 characteristics of all tumor types
| Tumors | Benign (n:48) | Malign (n:12) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| PA | WA | BCA | Cyst | Lipoma | BC | Adeno | SCC | FL | Total | ||
| Number of cases | 15 | 25 | 1 | 1 | 1 | 5 | 3 | 5 | 4 | 60 | |
| T1W | Pure hypointense | 8 (%53) | 8 (%32) | – | 1 | – | 3 (%60) | 2 (%67) | 1 (%20) | 3 (%75) | 26 (%43) |
| Pure hyperintense | 1 (%7) | 1 (%4) | – | – | 1 | – | – | – | – | 3 (%5) | |
| Heterogeneous hypointense | 4 (%27) | 13 (%52) | 1 | – | – | 1 (%20) | 1 (%33) | 4 (%80) | 1 (%25) | 25 (%42) | |
| Heterogeneous hyperintense | 2 (%13) | 2 (%8) | – | – | – | – | – | – | – | 4 (%7) | |
| Isointense | – | 1 (%4) | – | – | – | 1 (%20) | – | – | – | 2 (%3) | |
| T2W | Pure hypointense | – | – | – | – | – | – | – | – | 2 (%50) | 2 (%3) |
| Heterogeneous hypointense | 1 (%7) | 2 (%8) | – | – | – | – | 2 (%67) | 3 (%60) | 2 (%50) | 10 (%17) | |
| Isointense | – | – | – | – | – | – | – | – | – | – | |
| Hyperintensea | Type 1 | 13 (%86) | 7 (%28) | – | – | – | 1 (%20) | – | – | – | 21 (%35) |
| Type 2 | – | 16 (%64) | – | – | – | 1 (%20) | – | – | – | 17 (%28) | |
| Type 3 | 1 (%7) | – | – | 1 | 1 | 3 (%60) | – | – | – | 6 (%10) | |
| Type 4 | – | – | 1 | – | – | – | 1 (%33) | 2 (%40) | – | 4 (%7) | |
Adeno, adenocarcinoma; BC, benign cytology; BCA, basal cell adenoma; Cyst, lymphoepithelial cyst; FL, follicular lymphoma; PA, pleomorphic adenoma; SCC, squamous cell carcinoma; WA, Warthin tumor.
a
Increased signal intensity feature in T2W images was divided into four subgroups; Type 1: hyperintense dominant, including hypointensity, Type 2: hypointense dominant, including hyperintensity, Type 3: pure hyperintense, Type 4: heterogeneous hyperintense.