Markedly dilated ventricular system in keeping with hydrocephalus.
Turbulence caused by CSF flow resulted in abnormal mass-like lesion within the suprasellar cistern and third ventricle with high FLAIR and low T2 signal. The rest of the study shows no evidence of a mass even in post-contrast images.
A small CSF pulsation artifact is also seen at the left lateral ventricle.