What features are against this being a subependymal giant cell astrocytoma?
No stigmata of tuberous sclerosis, no enhancement.
What are the signal characteristics of central neurocytomas?
Hyperintense on T2 often irregular and bubbly. Hypointense on T1. Faint enhancement common in larger lesions.
A 1.1 x 1.3 cm well-defined lesion closely related to the septum pellucidum and right foramen of Munro demonstrates mild hyperintensity on FLAIR weighted images and his isointense on T1 weighted images. No discernible enhancement. The ventricles demonstrate mild prominence of the occipital horns however the remainder of the lateral ventricles, third and fourth ventricles are within normal limits. No other focal lesions are identified. Vascular flow voids are preserved.