MRI and intraocular tamponade media

Manfrè, L.; Fabbri, G.; Avitabile, Teresio; Biondi, Pietro; Reibaldí, A.; Pero, G.

doi:10.1007/bf00588370

Cited by 11 publications

(7 citation statements)

References 6 publications

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“…Although FA remains the modality of choice in the assessment of a BRB breakdown, MRI could be potentially considered as an interesting, easy-to-perform and safe diagnostic tool in BOB openings detection, especially in those cases in which because of optic media opacity (corneal scars, lens cataract, vitreous body haemorrhages or intraocular silicon oils) opacity [14], FA cannot be performed.…”

Section: Discussionmentioning

confidence: 99%

Blood-ocular barrier damage: use of contrast-enhanced MRI

et al. 1997

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The blood-ocular barrier (BOB) shares similar neuroepithelial origin, microanatomy and functions with the blood-brain barrier. There are many natural (e. g. diabetes, hypertension) or iatrogenic (chemotherapy, retinal photocoagulation) conditions which can cause a BOB breakdown, resulting in visual acuity impairment or loss. The authors examined 42 patients affected by BOB damage in different pathological conditions. All patients previously underwent a conventional fluoroangiographic (FA) study. Nine patients with normal FA exam were evaluated also. Despite normal MRI findings immediately after Gd-DTPA injection, contrast leakage into the vitreous body or into the aqueous fluid was demonstrated in delayed scans (40-50 min after contrast administration), proving the existence of a BOB damage (sensitively 94 %). Although FA exam remains the choice modality in BOB breakdown demonstration, we propose MRI as a useful diagnostic tool when optic media opacity (cataract, haemovitreous, intraocular silicon oil) occurs, preventing direct retinal fundus imaging and/or an early screening tool.

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Section: Discussionmentioning

confidence: 99%

Blood-ocular barrier damage: use of contrast-enhanced MRI

et al. 1997

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“…The conduction velocity of ultrasound in silicone oil is drastically reduced (55-60% less than in the normal vitreous) producing distortion and linear magnification of the image (Manfre et al 1993). Imaging artifacts arise due to reflection from silicone oil interfaces and attenuation of sound waves due to the silicone oil (Clemens et al 1984).…”

Section: Discussionmentioning

confidence: 99%

“…Magnetic resonance imaging (MRI) has recently been evaluated as a useful tool for detecting recurrent retinal detachment and evaluation of posterior segment of the eyes with silicone oil (Manfre et al 1993;Yoshida et al 1991). However, MRI as an imaging modality may not be in widespread use due to its high cost at all centres.…”

Section: Discussionmentioning

confidence: 99%

“…However, MRI as an imaging modality may not be in widespread use due to its high cost at all centres. MRI of the eye is still in its infancy and only limited studies are available (Manfre et al 1993;Yoshida et al 1991). Thus, the existing modalities need to be modified for the evaluation of the posterior segment of eyes with silicone oil.…”

Section: Discussionmentioning

confidence: 99%

“…However, presence of cataract and corneal opacities may prevent ophthalmoscopic evaluation and emulsification of silicone oil may limit the ultrasonographic evaluation of recurrent detachments in such cases (Manfre et al 1993). Moreover, significant imaging artifacts arise due to reflection and attenuation of sound waves (Yoshida et al 1991).…”

Section: S Ince Its Introduction By Cibis In 1962mentioning

confidence: 99%

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Prone position ultrasonography in silicone filled eyes

Kumar

Sharma

Singh

1998

Acta Ophthalmologica Scandinavica

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ABSTRACT.Purpose: To evaluate the efficacy of a new technique of prone position ultrasonography in cases with silicone filled eyes. Methods: Forty patients with prior pars plana vitrectomy and silicone oil instillation referred to a tertiary eye care centre were the subjects of this study. A prospective clinical trial was undertaken to evaluate the efficacy of prone position ultrasonography in addition to routinely performed supine position ultrasonography in these patients. The technique was undertaken by 2 independent observers and compared with the findings by indirect ophthalmoscopy or surgical results. Interobserver variability was also calculated. Results: Two spikes were observed in supine position corresponding to the intravitreal silicone oil surface and the sclera, whereas a single spike corresponding to the sclera was observed in prone position. Supine position ultrasonography yielded a diagnostic accuracy of 61.8% which inreased to 96.7% when the procedure was supplemented with prone position ultrasonography. Specificity increased from 75 to 100% by the addition of this adjuvant procedure, however, with no significant difference in the interobserver variability ('K'Ω0.67 Vs 'K'Ω 0.62). Conclusion: Prone position ultrasonography is a useful adjunct to the routinely performed supine position ultrasonography in silicone filled eyes and increases the diagnostic yield.

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