Abstract
The paper reports a case of diverticulum in the medial wall of the trigone in a 46-year-old male with symptoms of paroxysmal headache, blurred vision, and visual field narrowing.
The occurrence of diverticulum in the medial wall of the trigone has been known as a partial cystic enlargement caused by the rise of intraventricular pressure in the extreme phase of non-communicating hydrocephalus. However, this was a case with mild communicating hydrocephalus. It is assumed that the congenital abnormalities in the cerebrum and ventricular formation may have been contributing factors in this case, since asymmetrical dilatation of the lateral ventricles and asymmetrical thickness of the cerebral mantle were observed, and the enlargement of the trigone and posterior horn was larger than that of the anterior horn.
