<s>[INST] my husband age 37 male He had a C.T scan and M.R.I in which reports shows that he is having atypical arachnoid cyst/posterior fossa epidermoid cyst.and here nuero surgeon adviced surgery can help out,i am very much confussed what to do,because brain surgery is a serious matter,i need your help please advice me what to do? Here i am giving the detail of M.R.I and C.T scan----- M.R.I axial-T1,T2,T1(post gad) Coronal-T2,T1(post gad) sagital-T2 flair,T1(post gad) Oservations----- midline  heterogeneous posterior fossa cystic lesion descending up to CVJ with rim enhancement with heterogeneity within,measuring approx 41.5*27.5*18.0mm. Opinion-- Posterior fossa Epidermoid cyst /Atypical Arachnoid cyst. [/INST] If your surgeon feels that this is an epidermoid cyst, it is large enough to consider surgery to remove it, as these cysts can enlarge over time. </s>