Table 2: MR Imaging findings of BCAs, PAs and WTs.
| BCA (n = 9) | PA (n = 62) | P-values (PA vs. BCA) | WT (n = 58) | P-values (WT vs. BCA) | |
|---|---|---|---|---|---|
| Right/left side | 0.827† | 0.703† | |||
| Right side | 6 (66.67) | 35 (56.45) | 31 (53.45) | ||
| Left side | 3 (33.33) | 27 (43.55) | 27 (46.55) | ||
| Location | 0.346‡ | 0.430‡ | |||
| Superficial lobe | 6 (66.67) | 42 (67.74) | 37 (63.79) | ||
| Deep lobe | 0 (0) | 9 (14.52) | 9 (15.52) | ||
| Both lobes | 3 (33.33) | 11 (17.74) | 12 (20.69) | ||
| Size | |||||
| Maximum (mm) | 22.7 ±9.8 | 24.8 ±10.0 | 0.523# | 23.5 ±13.4 | 0.769# |
| Shape | 0.046† | 0.142† | |||
| Round/ovoid | 9 (100) | 37 (59.68) | 41 (70.69) | ||
| Lobulated | 0 (0) | 25 (40.32) | 17 (29.31) | ||
| Capsule | 1.000‡ | 1.000‡ | |||
| Presence | 9 (100.00) | 60 (96.77) | 54 (93.10) | ||
| Absence | 0 (0) | 2 (3.23) | 4 (6.90) | ||
| T2 SI | 0.001‡ | 0.13‡ | |||
| Hyperintensity | 0 (0) | 11 (11.74) | 0 (0) | ||
| Mixed hyper- and hypointensity | 2 (22.22) | 43 (69.36) | 3 (5.17) | ||
| Hypointensity | 7 (77.78) | 8 (12.90) | 55 (94.83) | ||
| T1 SI | 0.426‡ | 0.252‡ | |||
| Hypointensity | 8 (88.89) | 59 (95.16) | 57 (98.28) | ||
| Mixed hypo- and hyperintensity | 1 (11.11) | 3 (4.84) | 1 (1.72) | ||
| 1 (1.72) | 0.124† | < 0.001† | |||
| Marked | 9 (100) | 43 (69.35) | 3 (5.17) | ||
| Mild | 0 (0) | 14 (30.65) | 55 (94.83) | ||
| Cystic area | 0.052‡ | 0.056‡ | |||
| Irregular | 3 (33.33) | 4 (6.45) | 3 (5.17) | ||
| Round/ovoid | 3 (33.33) | 24 (38.71) | 26 (44.83) | ||
| Absence (solid) | 3 (33.33) | 34 (54.84) | 29 (50) |
Data are expressed as mean ±standard deviation for continuous variables or numbers of lesions with percentages in parentheses. †P value by the continuity corrected Chi-square test; ‡ P value by Fisher exact test; #P value by Mann-Whitney U test. BCA; Basal cell adenoma; PA: Pleomorphic adenoma; WT: Warthin tumor; SI: Signal intensity; T2: T2-weighted imaging; T1: Fat-suppressed T1 weighted imaging.