Periventricular leukomalacia and quadrigeminal cistern arachnoid cyst
Diagnosis almost certain
Presentation
Partial epilepsy.
Patient Data
Age: 6 years
Gender: Female
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There is a well-defined cyst of CSF-density (25 x 20 x 15 mm) at the quadrigeminal cistern with mild mass effect on the tectal plate, cerebellum, straight sinus, and vein of Galen.
Mild dilatation of the lateral ventricles mainly the trigones.
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- The previously described cyst of the quadrigeminal cistern demonstrates a CSF signal on all sequences with no restricted diffusion on DWI/ADC.
- Signs of periventricular leukomalacia:
- dilated lateral ventricles (mainly the trigones) with irregular margins
- loss of periventricular white matter with increased T2/FLAIR signal
- thinning of the corporeo-splenial segment of the corpus callosum
Case Discussion
CT features most consistent with an arachnoid cyst of the quadrigeminal cistern (incidental finding) in a patient with a periventricular leukomalacia (PVL).
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