PMC5778723_01
Axial MR images of patient #1. Left: Discovery 3-D FSPGR MRI showing the 11.2-mm colloid cyst lesion. Right: 6-month post-aspiration and radiosurgery T1 MRI demonstrating that the cyst was reduced in size to 7.3 mm
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F1
Accordingly, utilizing the Leksell frame and transaxial MRI scan of the brain without contrast [Figure 1, Left], the X-Y-Z coordinates for the target were calculated. Six months following stereotactic radiosurgery the patient underwent a follow-up MRI [Figure 1, Right] which revealed a lesion consistent with of a colloid cyst of the third ventricle measuring 7.3 mm in greatest dimension.
PMC5778723_02
Coronal T1 MR images with gadolinium of patient #2. Left: Discovery MRI showing the 12-mm colloid cyst lesion at the anterosuperior aspect of the third ventricle. Right: 4-year post-aspiration and radiosurgery MR images demonstrating only the colloid cyst capsule remnants
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F2
The MRI [Figure 2, Left] was significant for a 12-mm lesion at the anterosuperior aspect of the third ventricle in the region of the foramen of Monro suggestive of a colloid cyst. The most recent MRI [Figure 2, Right] taken in January 2013 showed no evidence of recurrence of the colloid cyst.
PMC5778723_03
Radiologic images of patient #3. Left: Discovery MR image showing a mass within the anterior third ventricle at the foramen of Monro representative of a colloid cyst. Right: 6-week post-stereotactic aspiration and pre-stereotactic radiosurgery planning T1-weighted MRI demonstrating reduction in ventricle size as well as indicating that the colloid cyst is no longer identified by the imaging study
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F3
An MRI [Figure 3, Left] revealed a mass measuring 7.7 mm x 7.2 mm within the anterior third ventricle at the foramen of Monro indicative of a colloid cyst. A planning MRI [Figure 3, Right] revealed a reduction in ventricle size and no identifiable residual lesion of the colloid cyst.
PMC5778723_04
Axial CT scans of patient #4. Left: Discovery CT scan showing a colloid cyst of 13 mm with dilatation of the lateral ventricles and slight asymmetry on the right. Right: CT scan at 6-year follow-up demonstrating absence of the colloid cyst
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F4
CT scan of the brain [Figure 4, Left] revealed that there was evidence of a hyperdense colloid cyst within the right third ventricle at the junction of the foramen of Monro with mild dilation of the right lateral ventricle. The most recent axial CT without contrast [Figure 4, Right] from October 2015 demonstrates that the previously noted hyperdense presumed colloid cyst is no longer present.