fig 2.

Postmortem MR imaging. A, Coronal T1-weighted image (560/15/1 [TR/TE/excitations]) of the fixed brain shows that the colloid cyst is centrally of higher signal intensity [c] and its rim is relatively hypointense. The lesion is oval-shaped in this projection. The linear hyperintensities in the left basal ganglia are related to a hemorrhagic infarction (see fig 3A).

B, Corresponding proton density–weighted image (4500/15/1) shows the lesion to be homogeneous and of similar signal intensity to white matter.

C, Corresponding T2-weighted image (4500/105/1) shows the central portion of the cyst to be hypointense and its rim to be slightly hyperintense. Cortical sulci dilatation is well seen in this sequence.