Cerebellar cystic mass causing obstructive hydrocephalous

A 60 year old gentleman from rural background presented with history of worsening bifrontal headache, intractable vomitings and ataxic gait for last one month. All general and systemic examination was normal except neurological examination which revealed cerebellar signs on right side and bilateral papilloedema. The computerized tomography of brain revealed a large well defined, non-enhancing multilocular cyst with internal septations and without any perilesional oedema in right cerebellar region causing compression of fourth ventricle. The patients was referred to neurosurgeon with a probable diagnosis of hydatid cyst for excision of the cyst. During surgery the cyst got ruptured and found to be filled with xanthochromic fluid and was lined by white membrain.