Table 4.
Distribution of individual MRI features amongst the given non-contrast MRI score (n=350 lesions) according to assessment of reader 1
| Variable | Score 2^ (n = 281) | Score 3 (n = 12) | Score 4 (n = 28) | Score 5 (n = 29) |
|---|---|---|---|---|
| Lesion size (mm), median (IQR) | 60 (41, 86) | 80 (40, 121) | 66 (46, 100) | 94 (53, 130) |
| Purely endometriotic mass | 71 (25.3%)* | 1 (8.3%) | 0 (0.0%) | 0 (0.0%) |
| Fatty mass | 79 (28.1%) | 0 (0.0%) | 1 (3.6%) | 0 (0.0%) |
| Solid mass | 24 (8.5%) | 4 (33.3%) | 5 (17.9%) | 13 (44.8%) |
| Simple cystic mass | 34 (13.2%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) |
| Multiple septa | 89 (34.6%) | 5 (62.5%) | 12 (52.2%) | 14 (87.5%) |
| Thick or irregular septa# | - | 4 (50%) | 8 (36%) | 12 (75%) |
| Cystic fluid composition | ||||
|
Serous Mucinous Blood Fat Pus |
77 (30.0%) 23 (8.9%) 74 (28.8%) 79 (30.7%) 4 (1.6%) |
2 (25.0%) 5 (62.5%) 1 (12.5%) 0 (0.0%) 0 (0.0%) |
13 (56.5 %) 1 (4.3%) 7 (30.4%) 1 (4.3%) 1 (4.3%) |
12 (75.0%) 3 (18.8%) 1 (6.2%) 0 (0.0%) 0 (0.0%) |
| Solid tissue in the mass | 55 (19.6%) | 10 (83.3%) | 28 (100%) | 29 (100%) |
| Intermediate T2 signal of solid tissue | 12 (22%) | 5 (50%) | 27 (96%) | 29 (100%) |
| High DWI signal of solid tissuea | 24 (44%) | 3 (30%) | 28 (100%) | 29 (100%) |
| Diffusion restriction in the solid tissue | 23 (42%) | 3 (30%) | 28 (100%) | 29 (100%) |
| Ascites | 8 (2.8%) | 1 (8.3%) | 2 (7.1%) | 21 (72.4%) |
| Peritoneal implants | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 13 (44.8%) |
|
Lymphadenopathy Pelvic LAD Para-aortic LAD Inguinal LAD |
2 (0.7%) 2 (0.7%) 0 (0.0%) 0 (0.0%) |
0 (0.0%) 0 (0.0%) 0 (0.0%) 0 (0.0%) |
0 (0.0%) 0 (0.0%) 0 (0.0%) 0 (0.0%) |
8 (27.6%) 7 (24.1%) 2 (7.1%) 1 (3.4%) |
DWI diffusion-weighted imaging, LAD lymphadenopathy
^In definition of non-contrast MRI score, scores 2, 3, 4 and 5 refer to benign/likely benign, indeterminate, suspicious and highly suspicious masses, respectively
*Unless otherwise specified, data are numbers of lesions with the relevant MRI feature, with percentages in parenthesis
#Thick or irregular septa was not evaluated for score 2 lesions
aDWI signal of the solid tissue is evaluated on high b value (800–1000s/mm2) DWI images