2026-06-05
Introduction: Trigeminal neuromas often originate at the trigeminal ganglion. Approximately 50% are located in the middle cranial fossa, extradurally. They grow slowly and may extend into the cavernous sinus and the superior orbital fissure. Secondly, they can be located on the trigeminal nerve root, with about 30% situated in the posterior cranial fossa, intradurally, and may invade surrounding cranial nerves. About 25% can be located in the petrous part of the temporal bone, spanning both intradural and extradural compartments of the middle and posterior cranial fossae.
Trigeminal neuromas often originate at the trigeminal ganglion. Approximately 50% are located in the middle cranial fossa, extradurally. They grow slowly and may extend into the cavernous sinus and the superior orbital fissure. Secondly, they can be located on the trigeminal nerve root, with about 30% situated in the posterior cranial fossa, intradurally, and may invade surrounding cranial nerves. About 25% can be located in the petrous part of the temporal bone, spanning both intradural and extradural compartments of the middle and posterior cranial fossae. Twenty percent are dumbbell-shaped, simultaneously involving both the middle and posterior cranial fossae.
Late-stage symptoms of trigeminal neuroma
Although trigeminal schwannomas are benign tumors, as they continuously grow, they eventually compress various intracranial neural tissues, leading to progressively increased intracranial pressure. In the late stage of trigeminal schwannoma, patients often experience headache, with the pain intensifying over time. Additionally, there is ipsilateral facial sensory disturbance, usually numbness, but pain or paresthesia may also occur. Other symptoms include unilateral facial spasm, hearing impairment, focal epilepsy, hemiplegia, gait abnormality, increased intracranial pressure, Eustachian tube obstruction, ear pain, and proptosis. There may be diplopia, proptosis, visual field defects, and parasellar or paratrigeminal syndromes. Cerebellopontine angle syndrome is common, including hearing loss, dizziness, and gait abnormality.
Can trigeminal neuroma be cured?
Can trigeminal neuroma be cured? Professor James T. Rutka, a member of the INC International Neurosurgical Advisory Group, former President of the International Academy of Neurosurgery, and Director of Neurosurgery at The Hospital for Sick Children in Toronto, Canada, stated that for the treatment of trigeminal schwannomas, surgical resection is the preferred option. The goal of surgery should be total resection; theoretically, if complete surgical resection is achieved, recurrence is generally unlikely. However, total resection is difficult. For large tumors or those where the capsule adheres to surrounding blood vessels and nerves, only subtotal resection may be possible. Only under the hands of a world-class neurosurgeon can a greater extent of resection be achieved.
If a trigeminal schwannoma has progressed to an advanced stage, extensive surgical resection is often impossible, and the probability of postoperative recurrence is relatively high. The recurrence of trigeminal schwannoma is not only related to the extent of surgical resection but also significantly related to the tumor location. Dumbbell-shaped tumors are surgically challenging because they straddle the petrous apex, occupying both the middle and posterior cranial fossae, and may extend both intracranially and extracranially. Complete resection is very difficult intraoperatively, and the postoperative recurrence rate is high. Postoperative complications include cranial nerve injury, cerebrospinal fluid leak, meningitis, and hydrocephalus. Many patients experience varying degrees of persistent trigeminal nerve palsy after surgery. However, pre-existing neurological deficits may improve. New postoperative cranial nerve dysfunctions, such as abducens and oculomotor nerve palsies, usually improve within 4 months.
INC International Neurosurgeons Circle reminds: Trigeminal neuroma can be treated effectively in its early stages. Patients should promptly seek treatment at a regular (qualified) neurosurgical hospital to avoid progression to an advanced stage, where treatment becomes difficult and the symptoms cause significant suffering.
