PMC8102953_01
T2-weighted midsagittal magnetic resonance imaging scans revealing a progressive Chiari I malformation in a patient with unilateral sporadic retinoblastoma treated by enucleation of the left eye. Basion-opisthion line is shown to determine the herniation of cerebellar tonsils through the foramen magnum at 4.5-year-old (a) and 5-year-old (b) visits. Orbital socket filled with hydroxyapatite is also shown (c)
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PMC8102953_01_JCO-33-88-g001.jpg
F1
The progression of CIM was confirmed by the radiologist in the last MRI, which was performed at 5 years of age [Figure 1].