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Right intraventricular non-enhancing mixed cystic/solid lesion with fat lying antedependently within the lateral ventricles. There is direct extension into the suprasellar cistern and inferiorly into the posterior cranial fossa cisterns. The cystic component results in significant mass effect and distortion of the thalami, cerebral peduncles, midbrain and upper pons. The right middle cerebral artery is anteriorly displaced secondary to the mass. There is shift of the third ventricle to the left of up to 11mm. Incidental Tornwaldt cyst in the nasopharynx.