Table 1. T1W and T2W Characteristics of Globe Structures.
Layer | MRI Sequences-Normal Anatomical Features | Pathology by Region | |
---|---|---|---|
T1W | T2W | ||
Tenon's capsule | Not usually visible. Can be distended by fluid/hemorrhage accumulating in potential episcleral space | Effusions due to infection, inflammation, trauma (hemorrhage), neoplasms/metastases (Figs. 2, 3) | |
Cornea | Hypointense-can be highlighted by an overlying T1W hyperintense tear film | Hypointense | Traumatic, infective/inflammatory disruption (Figs. 4, 5) |
Sclera | Hypointense | Hypointense | Episcleritis/scleritis: exudative chorioretinal detachment (Fig. 3) |
Staphylomas (Fig. 6) | |||
Colobomas | |||
Phthisis bulbi (Figs. 7, 8) | |||
Scleral bands (Figs. 8, 9) | |||
Scleral calcifications (Fig. 10) | |||
Uveal tract, choroid | Hyperintense | Hypointense | Choroidal detachments (Figs. 11, 12, 13) |
Retina | Hyperintense-not usually seen separately from underlying choroid | Hypointense | Retinal detachments (Fig. 11) |
Treated detachment, e.g., scleral bands (Figs. 8, 9), silicone oil (Fig. 14), and pneumatic retinopexy (Fig. 15) | |||
Ocular neoplasms: melanoma (Fig. 16), metastases (Fig. 17), vascular neoplasms/phakomatoses (Fig. 18) | |||
Uveitis (Fig. 19) | |||
Aqueous/vitreous humour | Hypointense | Hyperintense | Endophthalmitis |
Posterior vitreous detachment | |||
Lens | Hypointense | Hypointense | Lens prostheses |
Lens dislocation (Fig. 20) |
T1W = T1-weighted, T2W = T2-weighted