Acoustic schwannoma (large with cystic change)
MRI demonstrates typical findings of a large left sided acoustic schwannoma with cystic change - a common finding in larger schwannomas.
The patient went on to have a resection.
Histology
Microscopic Description:
Sections show a variably cellular tumor with compact areas of fascicular growth pattern and prominent nuclear palisading and less cellular regions composed of reticular cells in a microcystic pattern. There are sclerotic blood vessels, hemosiderin-laden macrophages and focal chronic inflammation.
Final Diagnosis:
Brain, left acoustic lesion: acoustic schwannoma.