Papers of the Week

Colloid cysts of the third ventricle are benign congenital lesions. They are at times totally asymptomatic or may be detected in the evaluation for headache, neurologic disturbances or psychiatric disturbances. They may sometimes cause grave consequences like coma or even sudden death. The radiologic appearance is unique and important for making decisions in the management. We report our patient with colloid cyst who presented to us after sudden deterioration. It was noted that he underwent CT brain before 10 months in the evaluation of headache. Compared to previous CT, there was a sudden change in the density and size of colloid cyst with obstructive hydrocephalus. This unique change in the character of colloid cyst occurred without any intervention. We discuss the possible aetiologies behind this phenomenon along with a review of literature .This case stands out remarkably, as it is only the second case in the literature with similar natural history.