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MRI of a child demonstrates bilateral retinoblastomas.
On the left there is a dominant 13 x 14 mm mass of decreased signal intensity on the T2 weighted images and mild contrast enhancement on the T1 weighted images. This is associated with dislocation of the lens and increased signal intensity within the globe on the T1 weighted sequences suggesting subacute haemorrhage.
On the right there are two mass lesions identified. The largest is identified in the inferior medial quadrant of the right globe and measures approximately 7 x 11 mm. A second separate 4 mm lesion is identified superiorly in the midline posteriorly. Both lesions are of decreased signal intensity on the T2 weighted images. (these are seen only in the coronal image)
Note the phase mismapping artefact on the post contrast T1 sequence resulting in an apparent area of contrast enhancement peripherally in the left occipital lobe.