Clinical-computed tomographic correlations in colloid cysts of the third ventricle.

The clinical and CT findings in 12 patients with colloid cysts are described. Eleven lesions appeared hyperdense on the plain scan and only one lesion was isodense. Five of the lesions showed contrast enhancement. Ten of twelve lesions had associated hydrocephalus. Two patients with colloid cyst had no abnormal neurological findings on examination; and it is unlikely that the symptoms which led to the performance of the CT scan were related to the colloid cyst.