Male, 83 years old, with non-small cell lung cancer, memory problems, abnormality noted on prior limited noncontrast MRI. Redemonstrated is a well-circumscribed, 16 x 16 x 12 mm mass which is centered on the anterior wall of the third ventricle. The lesion occupies the anterior aspect of the third ventricle and appears to splay the walls of the third ventricle laterally. The lesion is T2 hyperintense, T1 hypointense, non-diffusion restricting and solidly enhancing. Although the lesion is in close contact with the hypothalamic and thalamic tissues, there is no evidence of significant edema or invasion into these tissues.Within the limitations of motion degradation on the postcontrast sequences, no definite additional enhancing lesions are seen. Scattered small foci of FLAIR hyperintensity are seen within the periventricular white matter. No evidence of significant parenchymal edema is seen. No findings to suggest acute intracranial hemorrhage or any abnormal extra axial fluid collection are noted. Ventricular size and morphology are within normal limits.
A well-circumscribed, solidly enhancing mass is present occupying the anterior aspect of the third ventricle. The lesion appears relatively nonaggressive in that there is no evidence of invasion or edema within the adjacent thalamic and hypothalamic tissues.The morphology and location of this lesion are relatively characteristic of a chordoid glioma. A rare manifestation of some other indolent or low-grade glioma would also remain within the differential. Although metastatic disease cannot be excluded, this would be a very atypical presentation.I personally reviewed the Images and/or procedure with the Resident/Fellow and agree with this report.