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September 5, 2025Open Access

Lower Cranial Nerve Schwannomas

ZJZanib JavedAga Khan University Hospital Nairobi HWHaseeb WaheedAga Khan University Hospital NHNasr HussainAga Khan University Hospital Nairobi

Key Points

Lower cranial nerve schwannomas often lead to neurological deficits due to their complex anatomy.
Jugular foramen and hypoglossal schwannomas are the most common types, causing various symptoms.
Diagnosis mainly relies on MRI and CT imaging to differentiate these tumors from paragangliomas.
Gamma knife radiosurgery provides an effective treatment option for small or residual schwannomas.

Abstract

Lower cranial nerve (LCN) schwannomas are rare, benignperipheral nerve sheath tumours arising from cranialnerves IX–XII. Though uncommon, they pose significantclinical challenges due to their complex anatomicallocation and potential for neurological deficits. Jugularforamen schwannomas (JFS) and hypoglossalschwannomas (HS) are the most prevalent subtypes.Clinical presentation varies by nerve involvement, rangingfrom hoarseness and dysphagia to tongue atrophy andparoxysmal cough. Diagnosis relies heavily on MRI and CTimaging, with differentiation from paragangliomas beingcritical. Classification systems guide surgical planning, withgross total resection (GTR) being the goal, though subtotalresection (STR) is preferred in cases with dense neuraladherence to preserve function. Gamma knife radiosurgery(GKRS) offers an effective alternative for small or residuallesions. Treatment must balance tumor control withpreservation of neurological function, requiring amultidisciplinary and individualized approach.Keywords: Schwannoma, Benign Neoplasms, Cranial nerveneoplasms

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