Colloid Cyst – A Small Third Ventricle Cyst with Unusual Psammomatous Calcifications

Abstract

We report a case of a colloid cyst in the foramen of Monro, with an unusual finding of psammomatous calcifications. Colloid cysts of the third ventricle with calcifications in the wall are very rare. Colloid cysts are benign, slowly progressing lesions that most often arise from the roof of the anterior third of the ventricle along the foramen of Monro, account for almost 0.5-2% of all intracranial neoplasms, ranging from 1 to 3 cm in diameter and contain intraluminal homogenous mucoid or semi-solid colloid like material. Few cases have also been reported in septum pellucidum and fourth ventricle. They are usually incidentally discovered or can cause repeated attacks of worsening headache, syncope, memory loss and visual disturbances.

Keywords

• benign cyst
• foramen of monro
• rare