Pt. No. | Diagnosis | Appearance | T1 (intensity compared with muscle) | T1 Fat-Saturated Postcontrast (intensity compared with muscle) | T2 (intensity compared with muscle) |
---|---|---|---|---|---|
1 | OIS | Intraconal mass, involving muscle | Isointense | Enhancement > muscle | Isointense |
2 | OIS | Infiltrative, intra- and extraconal, + lacrimal gland involvement | Isointense | Enhancement > muscle | Hypointense |
3 | OIS | Infiltrative, thickening of eyelid, + lacrimal gland involvement | Slightly hyperintense | Enhancement > muscle | Hyperintense |
4 | OIS | Infiltrative, along optic nerve | Motion artifact | Enhancement > muscle | Isointense |
5 | Lymphoma | Mass just superior to superior rectus muscle | Hyperintense | Enhancement > muscle | Hyperintense |
6 | Lymphoma | Mass along conjunctiva, preseptal | Hyperintense | Enhancement < muscle | Hyperintense |
7 | Reactive lymphoid hyperplasia | Inflammatory thickening, retro-orbital fat and eyelid involvement | Isointense | Enhancement = muscle | Hypointense |
8 | Lymphoma | Inflammatory mass, extraconal | Isointense | Enhancement ≥ muscle | Hyperintense |
9 | Cellulitis | Infiltrative, pre- and postseptal, + abscess | Isointense | Enhancement > muscle | Hyperintense |
10 | Cellulitis | Infiltrative, intra- and extraconal | Isointense | Enhancement < muscle | Hyperintense |
11 | Cellulitis | Infiltrative, intraconal, involving muscle, + abscess | Isointense | Enhancement = muscle | Isointense |
12 | Cellulitis | Infiltrative, intra- and extraconal | Hyperintense | Enhancement < muscle | Hyperintense |
13 | Cellulitis | Infiltrative, intra- and extraconal, + abscess | Isointense | Enhancement > muscle | Hyperintense |
14 | Cellulitis | Infiltrative at orbital apex, + abscess | Isointense | Enhancement > muscle | Hyperintense |
Note:—Pt. indicates patient; OIS, orbital inflammatory syndrome.