Treatment of colloid cysts of the third ventricle by aspiration in stereotactic conditions.

Two cases of colloid cysts of the third ventricle are reported. The etiology, clinical symptoms and radiological diagnosis of such lesions are briefly discussed. CT-guided stereotactic aspiration of the cyst's content was performed, with good results in both cases. CT-scan controls performed one year later showed that refilling of the cysts did not occur. The advantages of the technique are described. Review of the literature showed another 17 cases successfully treated by means of stereotactic aspiration. The reliability of this approach is supported by the good outcome and the long follow-up of cases previously reported by other Authors. In our opinion, stereotactic aspiration should thus be the first step in the management of colloid cysts.