Classification of the lesions: Where is the tumor? Is it intra-axial or extra-axial (Outside the brain)          Is it located at Cerebellopontine angle, Jugular foramen or Petrous apex Common lesions found at Petrous Apex:    Cholesterol  Granuloma        Mucocoele           Cholesteatoma (epidermoid)          Chondroma/Chondrosarcoma         Trigeminal schwannoma           Metastasis Common lesions found at CPA:           Vestibular  Schwannoma           Meningioma           Epidermoid Cyst           Arachnoid Cyst           Lipoma Common Lesions found at Jugular Foramen         Glomus tumours           Vagal Schwannoma           Metastasis Cerebellopontine Angle It is the area of the lateral (quadrigeminal) cistern containing CSF, arachnoid tissue, cranial nerves and their associated vessels.

Its boundaries are:           Medial – lateral surface of the brainstem          …