Cerebellopontine Angle Lesions Classification and Management

Vestibular Schwannoma Classification

Vestibular schwannomas are the most common CPA tumors, comprising over 80% of tumors in this region, according to the American Academy of Otolaryngology-Head and Neck Surgery 1
Vestibular schwannomas can be classified based on their location and extension, including intracanalicular, CPA, and combined types, as defined by the American Academy of Neurological Surgery 2, 3, 4

The Spetzler-Martin grading scale is used for arteriovenous malformations in the CPA region, with scores ranging from 1 to 5, and is recommended by the American Heart Association 5
The scale assesses size, location, and venous drainage, with higher scores indicating higher surgical risk, as reported by the Stroke journal 5

The American Academy of Otolaryngology-Head and Neck Surgery hearing classification system is commonly used to assess hearing preservation, with outcomes varying by tumor size, as reported by the Neurosurgery journal 4, 1
The House-Brackmann grading system is the standard for facial nerve function assessment, with preservation rates influenced by tumor size, surgical approach, and surgeon experience, as recommended by the American Academy of Neurological Surgery 4, 2

MRI with contrast is the gold standard for imaging CPA lesions, with a standard protocol including high-resolution 3D T1 pre- and post-contrast imaging, axial 2D T2 FLAIR, and other sequences, as recommended by the American College of Radiology 1
CT of the temporal bone may complement MRI for evaluating osseous integrity of the skull base and intratumoral calcification, as reported by the Praxis Medical Insights journal 1