MR imaging characteristics
| Orbital Lymphoma (n = 29) | Benign OLPDs (n = 18) | P Value | |
|---|---|---|---|
| Shape | Well-defined 7 (24) | Well-defined 10 (56) | P = .0006a |
| Ill-defined 21 (72) | Ill-defined 3 (17) | ||
| Lobulated 1 (3) | Lobulated 5 (17) | ||
| Signal intensity | |||
| T1WI | Iso 28 (97) | Iso 18 (100) | P = .2548 |
| Low 1 (3) | |||
| T2WI | Iso 27 (93) | Iso 16 (89) | P = .6147 |
| Low 2 (7) | Low 2 (11) | ||
| DWI | High 17 (100) | High 14 (93) | P = .2794 |
| Iso 1 (7) | |||
| Homogeneity and degree of contrast enhancement | Homogeneous 23 (85) | Homogeneous 15 (100) | P = .2787 |
| Inhomogeneous 4 (15) | |||
| High 2 (13) | P = .0519 | ||
| Iso 27 (100) | Iso 13 (87) | ||
| Presence of “flow void sign” | 17 (59) | 17 (94) | P = .0084a |
| Findings suggestive of sinusitis | 8 (28) | 16 (89) | P < .001a |
Note:—Data in parentheses are percentages.
↵a There were significant differences in shape of the lesions, presence of the “flow void sign,” and findings suggestive of sinusitis between the 2 groups.