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An Orthotopic Sciatic Nerve Xenograft for Neurofibromatosis Type 1 Neurofibromas
Published on: October 10, 2025
Radiosurgery for type II neurofibromatosis
Jeremy Rowe1, Matthias Radatz, Andras Kemeny
1National Centre for Stereotactic Radiosurgery, Royal Hallamshire Hospital, Sheffield, UK.
Progress in Neurological Surgery
|September 24, 2008
Summary
Radiosurgery offers a valuable minimally invasive option for neurofibromatosis type II (NF2) vestibular schwannomas (VSs). While results are less favorable than for sporadic tumors, it provides a manageable treatment for selected NF2 patients.
Area of Science:
- Neurosurgery
- Oncology
- Genetics
Background:
- Neurofibromatosis type II (NF2) is a genetic disorder characterized by the development of tumors, particularly vestibular schwannomas (VSs).
- Vestibular schwannomas in NF2 patients often present unique challenges for treatment due to their bilateral nature and association with other cranial nerve tumors.
- Current treatment options for NF2-associated VSs include observation, microsurgery, and stereotactic radiosurgery, each with distinct risk-benefit profiles.
Purpose of the Study:
- To evaluate the long-term outcomes and safety of radiosurgery for treating vestibular schwannomas in patients with neurofibromatosis type II.
- To assess the risk of malignancy following radiosurgery in NF2 patients.
- To provide evidence-based recommendations for the management of NF2-associated VSs.
Main Methods:
- Retrospective analysis of a consecutive series of 122 vestibular schwannomas in 92 patients treated with radiosurgery.
- Inclusion of an extended series of 22 additional patients with 906 patient-years of follow-up to evaluate malignancy risk.
- Detailed assessment of tumor control, hearing preservation, facial nerve function, and secondary malignancy development.
Main Results:
- At 8 years post-radiosurgery, 50% of NF2 VSs were well-controlled, 30% managed conservatively, and 20% required further treatment.
- Functional hearing was preserved in 40% of patients at 3 years, with deterioration in 40% and deafness in 20%.
- Facial palsy occurred in 5% of patients; two malignancies were recorded, a rate lower than spontaneous glioma development in NF2.
Conclusions:
- Radiosurgery is a valuable minimally invasive treatment option for selected NF2 patients with vestibular schwannomas.
- While clinical outcomes are less favorable than for sporadic tumors, radiosurgery offers a manageable approach considering the specific challenges of NF2.
- NF2 patients require individualized advice regarding radiosurgery due to the unique natural history of their condition.
