This protocol addresses the specific management of large vestibular schwannoma classified as Koos grade IV, with a diameter exceeding 3 cm, in the presence of brainstem compression — a presentation that carries distinct clinical priorities compared with smaller, lower-grade tumors.
Patients in this category present with a large vestibular schwannoma (Koos grade IV, diameter >3 cm) causing active brainstem compression. These patients typically have experienced eighth cranial nerve symptoms over a prolonged course. The dominant clinical urgency is relief of compression on the brainstem and stretched cranial nerves.
In this setting, the therapeutic strategy centres on surgical intervention directed at brainstem and cranial nerve decompression. An alternative strategy involving partial tumor reduction followed by additional management may also be considered. The full evidence-based algorithm — including the sequencing of options and the conditions under which each applies — is available in the complete protocol.
The primary therapeutic target is resolution of brainstem compression and decompression of the stretched cranial nerves.
DOI: 10.1093/neuonc/noz153
These patients typically suffer from eighth cranial nerve symptoms for a long time.
Primary goal of therapy is decompression of the brainstem and stretched cranial nerves, which makes surgery the only option.
For this reason, tumor mass reduction by incomplete resection, followed by SRS or observation, is a valid option (evidence class IV, good practice point).
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