Document Detail

Magnetic resonance imaging in patients implanted with Ex-PRESS stainless steel glaucoma drainage microdevice.
MedLine Citation:
PMID:  19232564     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To evaluate whether artifacts caused by a stainless steel glaucoma drainage device can alter the interpretation of magnetic resonance imaging (MRI) scans of the optic nerve and brain. DESIGN: Consecutive case series. METHODS: Five patients (7 eyes) with Ex-PRESS devices (Optonol Ltd, Neve Ilan, Israel) positioned at the limbus were studied. For each subject, an axial T1-weighted, axial and coronal T2-weighted with fat saturation, and whole brain proton density (PD)/T2-weighted MRI scan was obtained. Standard MRI protocol was not optimized for the imaging of patients harboring Ex-PRESS implants. The effects of the device on PD/T2 pulse sequence imaging of the optic nerve and brain were rated from 1 (optic nerve margins unidentifiable or brain details altered) to 5 (excellent visualization of the optic nerve and brain). RESULTS: For optic nerve visualization, 1 optic nerve scored 2, 3 optic nerves scored 3, and 3 optic nerves scored 4 (mean, 3.3 +/- 0.8 standard deviation). For whole brain imaging, 4 patients scored 4 and 1 patient scored 5 (mean, 4.2 +/- 0.4 standard deviation). CONCLUSIONS: Our data demonstrate that interpretation of MRI scans of the orbit and brain is unaffected by the artifacts caused by the Ex-PRESS shunt, whereas optic nerve imaging may be affected. We are unaware of previous reports of this finding and could find no reference to it in a computerized search using PubMed.
Fabio De Feo; Luca Roccatagliata; Laura Bonzano; Lara Castelletti; Gianluigi Mancardi; Carlo Enrico Traverso
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-02-20
Journal Detail:
Title:  American journal of ophthalmology     Volume:  147     ISSN:  1879-1891     ISO Abbreviation:  Am. J. Ophthalmol.     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-04-20     Completed Date:  2009-04-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370500     Medline TA:  Am J Ophthalmol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  907-11, 911.e1     Citation Subset:  AIM; IM    
Centro di Ricerca Clinica e Laboratorio per il Glaucoma e la Cornea, Clinica Oculistica, Di.N.O.G., University of Genova, Genova, Italy.
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MeSH Terms
Anterior Eye Segment / pathology*
Aqueous Humor / secretion
Brain / pathology
Glaucoma Drainage Implants*
Glaucoma, Open-Angle / diagnosis*,  surgery*
Intraocular Pressure
Magnetic Resonance Imaging*
Optic Nerve / pathology
Prosthesis Implantation
Stainless Steel*
Tonometry, Ocular
Visual Acuity
Reg. No./Substance:
12597-68-1/Stainless Steel

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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