Posterior Fossa Arachnoid Cyst & Tonsillar Descent
17 year old girl with headache. Evidence of CSF iso-intense lesion measuring 2.1 x 1cm, non-enhancing in nature in the right cerebellopontine region extending inferiorly to perimedullary region possible arachnoid cyst. There is evidence of tonsillar descent bilaterally, which may be congenital chiari malformation or secondary to arachnoid cyst. There is resultant dilatation of the lateral, IIIrd and IVth ventricle with periventrricular ooze, which indicates hydrocephalus.
Posterior Fossa Arachnoid Cyst & Tonsillar Descent Reviewed by Sumer Sethi on Friday, May 18, 2012 Rating: