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Table 1: 
T1- and T2-weighted appearance of lesions
Pt. No.DiagnosisAppearanceT1 (intensity compared with muscle)T1 Fat-Saturated Postcontrast (intensity compared with muscle)T2 (intensity compared with muscle)
1OISIntraconal mass, involving muscleIsointenseEnhancement > muscleIsointense
2OISInfiltrative, intra- and extraconal, + lacrimal gland involvementIsointenseEnhancement > muscleHypointense
3OISInfiltrative, thickening of eyelid, + lacrimal gland involvementSlightly hyperintenseEnhancement > muscleHyperintense
4OISInfiltrative, along optic nerveMotion artifactEnhancement > muscleIsointense
5LymphomaMass just superior to superior rectus muscleHyperintenseEnhancement > muscleHyperintense
6LymphomaMass along conjunctiva, preseptalHyperintenseEnhancement < muscleHyperintense
7Reactive lymphoid hyperplasiaInflammatory thickening, retro-orbital fat and eyelid involvementIsointenseEnhancement = muscleHypointense
8LymphomaInflammatory mass, extraconalIsointenseEnhancement ≥ muscleHyperintense
9CellulitisInfiltrative, pre- and postseptal, + abscessIsointenseEnhancement > muscleHyperintense
10CellulitisInfiltrative, intra- and extraconalIsointenseEnhancement < muscleHyperintense
11CellulitisInfiltrative, intraconal, involving muscle, + abscessIsointenseEnhancement = muscleIsointense
12CellulitisInfiltrative, intra- and extraconalHyperintenseEnhancement < muscleHyperintense
13CellulitisInfiltrative, intra- and extraconal, + abscessIsointenseEnhancement > muscleHyperintense
14CellulitisInfiltrative at orbital apex, + abscessIsointenseEnhancement > muscleHyperintense
  • Note:—Pt. indicates patient; OIS, orbital inflammatory syndrome.