Subretinal and Retrolaminar Migration of Intraocular Silicone Oil Detected on CT

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Fig 1.
Subretinal silicone oil migration (case 2). Axial CT image obtained 1 week following right intraocular silicone oil injection demonstrates a punctate region of increased attenuation at the optic nerve head (arrow).
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Fig 2.
Retrolaminar silicone oil migration at the level of the retrolaminar optic nerve and optic chiasm (case 6). A and B, Axial CT images 1 year after left intraocular silicone oil injection demonstrate abnormal increased attenuation of the intraorbital segment of the left optic nerve (A, arrow) and nodular increased attenuation at the optic chiasm (B, arrow).
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Fig 3.
Retrolaminar silicone oil migration to the retrolaminar optic nerve and optic chiasm and within the lateral ventricles (case 4). Axial CT images 6 years after left intraocular silicone oil injection demonstrate tubular increased attenuation of the intraorbital segment of the left optic nerve (A, arrow), nodular hyperattenuation in the optic chiasm/optic tract (B, arrow), and biconvex hyperattenuation in the nondependent regions of the frontal horns of the lateral ventricles (C, arrows).

Table 1:

Comparisons of clinical features between cases positive and negative for silicone oil migration

Clinical Characteristics	Cases Positive for Migration (n = 7)	Cases Negative for Migration (n = 50)	P	Total (n = 57)
Age (mean) (yr)	56.1 ± 16.6	57.5 ± 18.6	.942^{^a}	57.3 ± 18.3
Sex (male/female)	3:4	28:22	.691^{^b}	31:26
Indication for silicone oil injection treatment	Diabetic retinal detachment: 4	Diabetic retinal detachment: 30		Diabetic retinal detachment: 34
	Trauma: 1	Trauma: 3		Trauma: 4
	Cytomegalovirus retinitis: 1	Cytomegalovirus retinitis: 2		Cytomegalovirus retinitis: 3
	Advanced glaucoma: 1	Advanced glaucoma: 1		Advanced glaucoma: 2
		Postoperative hemorrhage: 1		Postoperative hemorrhage: 1
		Congenital infection: 1		Congenital infection: 1
		Unknown: 12		Unknown: 12
Interval between silicone injection treatment and CT examination (mean) (mo)	45.8 ± 41.8	37.4 ± 31.7	.779^{^a}	39.2 ± 33.5
Intraocular pressure (mean) (mmHg)	23.6 ± 21.4	15.2 ± 5.2	.291^{^a}	16.8 ± 10.5

Table 2:

Comparisons of attenuation values in the visual tract structures between silicone oil migration lesions and normal regions^{^a}

Structures (Lesion:Normal)	Silicone Oil Migration Lesion	Normal Region	P^{^b}
Optic head (2:112)	69.2 ± 12.4	29.8 ± 10.2	<.001
Optic nerve (5:119)	59.9 ± 11.6	30.9 ± 8.6	<.001
Optic chiasm (3:53)	74.2 ± 11.0	25.6 ± 6.9	<.001
Optic tract (3:109)	70.1 ± 4.7	28.7 ± 7.2	<.001