My son (30 week preterm) is diagnosed with 3.4 x4.8 mm arachanoid cyst in left basal ganglion will it cause any disorder r is it common. he had aopin

Needs observation: Most of the time get absorbed , may disappear , if symptomatic will need intervention .Arachanoid cysts are congenital most of the time or traumatic , cystic protrusions from arachnid membrane , due to loss of CSF ( cerebra spinal fluid ) , or pressure OM the adjacent vital structures cause symptoms , remarkable progress has been made with minimally invasive procedures ( surgery ) , .