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Related Experiment Videos

MR imaging in retinoblastoma

F Barkhof1, M Smeets, P van der Valk

  • 1Department of Diagnostic Radiology, Free University Hospital, P. O. Box 7057, NL-1007 MB Amsterdam, The Netherlands.

European Radiology
|January 1, 1997
PubMed
Summary

Magnetic resonance imaging (MRI) effectively characterizes retinoblastoma. Heavily T2-weighted and gadolinium-enhanced T1-weighted MRI scans, alongside unenhanced T1-weighted images, are crucial for accurate tumor staging and diagnosis.

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Area of Science:

  • Ophthalmology
  • Radiology
  • Pediatric Oncology

Background:

  • Retinoblastoma is the most common primary intraocular malignancy in children.
  • Accurate tumor staging is critical for treatment planning and prognosis.
  • Magnetic resonance imaging (MRI) offers detailed visualization of intraocular structures.

Purpose of the Study:

  • To evaluate the appearance of retinoblastoma on unenhanced and gadolinium-enhanced MRI.
  • To assess the accuracy of MRI in tumor staging compared to histopathological findings.
  • To determine the complementary roles of different MRI sequences.

Main Methods:

  • MRI was performed on 18 children with retinoblastoma using T1-weighted and dual-echo T2-weighted sequences before and after gadolinium contrast administration.

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  • Images were compared with histopathological findings after enucleation.
  • Specific MRI parameters like contrast enhancement and T2 relaxation times were analyzed.

    • Main Results:

    • Gadolinium enhancement significantly increased tumor-vitreous contrast on T1-weighted images (57% increase, p=0.004).
    • Tumors appeared hypointense on heavily T2-weighted images (TE=120 ms, p=0.001).
    • MRI accurately excluded extrascleral extension in most cases but had limitations in detecting subtle optic nerve invasion.

    Conclusions:

    • Heavily T2-weighted, unenhanced T1-weighted, and gadolinium-enhanced T1-weighted MRI sequences are complementary for retinoblastoma characterization.
    • MRI plays a vital role in staging retinoblastoma, aiding in treatment decisions.
    • T2-weighted images are particularly useful for assessing retinal detachment.