Migration Of Intraocular Silicone Oil Research Articles

Intracranial Migration of Intraocular Silicone Oil after Head Trauma

Intracranial Migration of Intraocular Silicone Oil after Head Trauma

SYMPTOMATIC MIGRATION OF SILICONE OIL TO THE VENTRICULAR SYSTEM.

The objective of this article is to report a case of silicone oil migration into intraocular packing in cases of retinal detachment, while reviewing the existing literature on the various mechanisms and locations of this migration. However, it is important to highlight that the use of this material is not free from complications. This article is a case report with a literature review. The information was obtained through a review of the medical record, interview and photographic record of the patient's diagnostic methods. PubMed was used as a database to perform the search for selected articles and literature review, selecting articles published from the year 2016. The exact mechanism of migration of intraocular silicone oil to the central nervous system is still unclear, being a rare complication that may be related to several factors. We report a case in which the patient underwent vitrectomy surgery and, after several years, presented a complication related to the migration of intraocular silicone oil to the right frontal horn and third ventricle, causing headache. Conclusion: Knowledge about migration of intraocular silicone oil into the central nervous system (CNS) is extremely important, since it manifests itself in several clinical and radiological findings, which can lead to incorrect diagnoses. Thus, it is suggested the follow- up of the patient after introduction of silicone oil to avoid complications that threaten results.

Remodelling of the lamina cribrosa thickness in proliferative diabetic retinopathy as a pathogenetic factor of retrolaminar migration of silicone oil after vitrectomy

Aims/Purpose: to analyse the relationship of lamina cribrosa (LC) thickness in patients with proliferative diabetic retinopathy (PDR) after vitrectomy with SiO tamponade with retrolaminar migration of intraocular silicone oil (SiO).Methods: This retrospective study included 35 patients with PDR after vitrectomy with SiO tamponade who underwent unenhanced head computed tomography for various clinical indications. All images were visually evaluated for subretinal and retrolaminar migration of SiO involving the anterior visual pathway (optic nerve, optic chiasm, and optic tract) and the ventricular system. LC thickness was measured with spectral domain optical coherent tomography (SD OCT) using LC_Thickness_programm.m and main_low_noise_filters_programm.m, based on the adaptive compensation algorithm for eliminating a high‐level noise in the deep layers of optic nerve and improving the visualization of the LC posterior border, as well as for processing B‐scan with a set of 3 digital filters: Butterworth Low‐pass Filter inverion image, Wavelet Low‐pass Filter Analysis Daubechies original and inversion image.Results: In our patients with PDR the average LC thickness was 697 ± 35 μm (589 to 768 μm), that was 1.9 times higher than in healthy people (p < 0.001). We detected subretinal and retrolaminar silicone oil migration in 10 of the 35 patients (28.57%), noting silicone oil at the optic nerve head (n = 2), retrolaminar optic nerve (n = 4), optic chiasm (n = 2), optic tract (n = 1) and in the lateral ventricles (n = 3). 3 patients had migration to 2 locations each (1 – in retrolaminar optic nerve and optic chiasm, 2 – in retrolaminar optic nerve and lateral ventricle). We compared the LC thickness of patients without and with subretinal and retrolaminar SiO migration. It was established that LC thickness of patients with subretinal and retrolaminar SiO migration was significantly less (589 to 658 μm) than in patients without SiO migration (673 to 768 μm). It should be noted that the number of cases positive for migration was small, limiting the statistical power and accuracy of the prevalence.Conclusions: A direct correlation between scleral LC thickness and retrolaminar migration of SiO in patients with PDR after vitrectomy with SiO tamponade was revealed.

Subretinal and Retrolaminar Migration of Intraocular Silicone Oil Detected on CT.

Intraocular silicone oil injection has been used to treat complicated retinal detachments, and recently its retrolaminar and intracranial migration has been reported. The purpose of this study was to document the prevalence of posterior migration of intraocular silicone oil on head CT and describe the clinical and radiologic findings. This retrospective study included 57 patients with intraocular silicone oil injection who underwent unenhanced head CT between November 2008 and July 2018. All images were visually evaluated for subretinal and retrolaminar migration of intraocular silicone oil involving the anterior visual pathway (optic nerve, optic chiasm, and optic tract) and the ventricular system. Attenuation values of those structures were measured and compared with those of the contralateral or adjacent normal structures. We detected subretinal and retrolaminar silicone oil migration in 7 of the 57 patients (12%), noting silicone oil at the optic nerve head (n = 2), retrolaminar optic nerve (n = 5), optic chiasm (n = 3), optic tract (n = 3), and in the lateral ventricles (n = 1). Attenuation values of the structures with silicone oil migration were significantly higher than those of the control regions (optic nerve head, 69.2 ± 12.4 vs 29.8 ± 10.2 HU, P < .001; retrolaminar optic nerve, 59.9 ± 11.6 vs 30.9 ± 8.6 HU, P < .001; optic chiasm, 74.2 ± 11.0 vs 25.6 ± 6.9 HU, P < .001; optic tract, 70.1 ± 4.7 vs 28.7 ± 7.2 HU, P < .001). No significant ophthalmic or neurologic complications were documented in the patients with silicone oil migration. Subretinal and retrolaminar migration of intraocular silicone oil is common. Although there were no apparent complications associated with silicone oil migration, the radiologist and clinician should be aware of this phenomenon.

Migration of intraocular silicone oil into the brain

A 74-year-old woman gave a 6-month history of predominately right-sided parietal headaches, often worse on waking. Her history included left phthisis bulbi (atrophy and calcification of the eye), resulting from...

Cerebral migration of intraocular silicone oil: an MRI study

Intraocular silicone oil may migrate into the optic nerve or the cerebral ventricles, but little is known about the frequency of these events. The aim of this prospective neuroimaging study was to determine the frequency of extraocular silicone oil migration in humans operated for retinal detachment. Nineteen patients included in this study were referred for silicone oil removal after uncomplicated retinal detachment surgery using internal silicone oil tamponade. Patients with a previous history of intraocular silicone oil, glaucoma or optic pit were excluded. After informed consent, the patients underwent magnetic resonance imaging (MRI). Fat saturation as well as short T1 inversion recovery (STIR) sequences combined with water saturation allowed silicone oil to be easily detectable. The mean delay between the silicone oil injection and the MRI procedure was 115 days. No extraocular silicone oil in the orbit, in the optic nerve or in the cerebral ventricles was found on MRI. This is the first published in vivo study on the frequency of extraocular silicone oil migration after retinal detachment surgery. Special dedicated MRI sequences are able to accurately visualize intraocular silicone oil. None of the included 19 patients were detected with silicone oil migration into the visual pathways or intracranially, suggesting that its occurrence may be very rare, maybe only in patients with optic nerve head anatomical predispositions.

Migration of intraocular silicone oil into the subconjunctival space and orbit through an ahmed glaucoma valve

PURPOSE: To report a patient with intraocular silicone oil migration into the subconjunctival space and orbit through an Ahmed glaucoma valve implant. METHODS: Observational case report. A 29-year-old female with diabetes mellitus and proliferative diabetic retinopathy underwent three left eye pars plana vitrectomies and ultimately intraocular silicone oil placement for tractional retinal detachment. Subsequently, she developed neovascular glaucoma and underwent an inferotemporal Ahmed glaucoma tube implant, left eye. RESULTS: Intraocular silicone oil migrated through the Ahmed glaucoma valve into the subconjunctival space and orbit. Left eye evisceration with silicone oil removal was performed for a blind painful left eye and improvement of appearance. CONCLUSION: Silicone oil migration through an Ahmed valve may be observed after retinal detachment repair with intraocular silicone oil. An Ahmed valve may be contraindicated in eyes of patients with intraocular silicone oil.