BRAIN - Colloid cyst

The specimen shows a thin-walled cyst some 2.0 cm in diameter occupying the third ventricle. The convolutions of the hemispheres are flattened.
This man, at the age of 39, was admitted to hospital with severe headaches; he is said to have suffered migraine for more than twenty years. With the onset of headache he had had two fits; on admission he was in coma with moderately dilated and fixed pupils; a lumbar puncture was carried out; the pressure was 43 cm of water. He subsequently had a respiratory arrest associated with a hypertensive episode. At autopsy, coning was demonstrated; the cyst described was found to be of ependymal origin. It is suggested that intermittent foraminal obstruction may have been responsible for the intermittent headaches he had suffered.