Abstract
Objectives
To assess the accuracy of high-resolution (HR) magnetic resonance imaging (MRI) in diagnosing early-stage optic nerve (ON) invasion in a retinoblastoma cohort.
Methods
This IRB-approved, prospective multicenter study included 95 patients (55 boys, 40 girls; mean age, 29 months). 1.5-T MRI was performed using surface coils before enucleation, including spin-echo unenhanced and contrast-enhanced (CE) T1-weighted sequences (slice thickness, 2 mm; pixel size <0.3 × 0.3 mm2). Images were read by five neuroradiologists blinded to histopathologic findings. ROC curves were constructed with AUC assessment using a bootstrap method.
Results
Histopathology identified 41 eyes without ON invasion and 25 with prelaminar, 18 with intralaminar and 12 with postlaminar invasion. All but one were postoperatively classified as stage I by the International Retinoblastoma Staging System. The accuracy of CE-T1 sequences in identifying ON invasion was limited (AUC = 0.64; 95 % CI, 0.55 – 0.72) and not confirmed for postlaminar invasion diagnosis (AUC = 0.64; 95 % CI, 0.47 – 0.82); high specificities (range, 0.64 – 1) and negative predictive values (range, 0.81 – 0.97) were confirmed.
Conclusion
HR-MRI with surface coils is recommended to appropriately select retinoblastoma patients eligible for primary enucleation without the risk of IRSS stage II but cannot substitute for pathology in differentiating the first degrees of ON invasion.
Key Points
• HR-MRI excludes advanced optic nerve invasion with high negative predictive value.
• HR-MRI accurately selects patients eligible for primary enucleation.
• Diagnosis of early stages of optic nerve invasion still relies on pathology.
• Several physiological MR patterns may mimic optic nerve invasion.
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Abbreviations
- HR-MRI:
-
High-resolution MRI
- ON:
-
Optic nerve
- IRSS:
-
International Retinoblastoma Staging System
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Acknowledgments
The scientific guarantor of this publication is Dr Hervé J. Brisse. The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article. Ophthalmologists: C Levy, L Lumbroso-Le Rouic, N Cassoux, M.I. Bosscha; Paediatricians: F Doz, W.A. Kors; Radiographer: S Lasalle; Biostatistics technicians: N Algret.
This study received funding from: The ODAS Foundation, Delft, The Netherlands (mailing, traveling costs, data management); and The RETINOSTOP foundation, Paris, France (data management, statistical analysis). Two of the authors (KC, AS) have significant statistical expertise. Institutional Review Board approval was obtained. Written informed consent was waived by the Institutional Review Board. Methodology: prospective, diagnostic, multicentre study.
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Brisse, H.J., de Graaf, P., Galluzzi, P. et al. Assessment of early-stage optic nerve invasion in retinoblastoma using high-resolution 1.5 Tesla MRI with surface coils: a multicentre, prospective accuracy study with histopathological correlation. Eur Radiol 25, 1443–1452 (2015). https://doi.org/10.1007/s00330-014-3514-1
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DOI: https://doi.org/10.1007/s00330-014-3514-1