Background: Arachnoid cysts (AC) are benign, congenital, non-neoplastic, extra axial, intra-arachnoid lesions filled with cerebrospinal fluid (CSF). Only 10% of arachnoid cysts occur in Cerebello-Pontine Angle (CPA). Bilateral ACs are very rare. Case Description: In this case report we present a one month baby who was evaluated for failure to thrive and hydrocephalus. Patient examination revealed cranial nerve seven and eight paresis and imaging was suggestive of bilateral CPA ACs which was treated with surgery. Literature Review: Pubmed search showed only three cases of bilateral ACs -one in an adolescent and two in adult population. Clinical Relevance: This is probably first reported case of bilateral CPA AC in a newborn with facial paresis.

Keywords: Arachnoid cysts (AC); Cerebrospinal fluid (CSF); Cerebellopontine angle (CPA).