• Journal of Korean Neurosurgical Society
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• v.29 no.4
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• pp.550-554
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• 2000

Most extracranial schwannomas are solitary, but neurofibromas are frequently associated with other manietations of neurofibromatosis. Schwannomas that occur within the context of neurofibromatosis tend to be multiple, but multiple schwannomas without manifestation of neurofibromatosis type 2 are very rare. The authors report a very rare case of multiple spinal intradural schwannomas in the absence of neurofibromatosis Type 2 maniestations. A 40-year-old man suffered from longstanding low back pain and left side sciatica which was treated with two stage operations. MRI showed multiple intradural mass lesions extending from L1 vertebral segment to S1 vertebral segment. There were no clinical and radiological manifestations of Type 2 neurofibromatosis. Histologically confirmed diagnosis was schwannoma.

• Archives of Craniofacial Surgery
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• v.21 no.6
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• pp.380-383
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• 2020

Schwannomas, which originate from Schwann cells in the peripheral nervous system, are slowg-rowing and uncommon benign tumors. Most schwannomas (90%) occur in isolation, and multiple occurrences are a characteristic feature of neurofibromas. Schwannomas of the nose and nasal tip are particularly unusual. Although a few cases of schwannomas of the sinusoidal tract and nasal septum have been reported, schwannomas arising from the nasal dorsum area and tip are extremely rare. Sensory abnormalities are also a very rare symptom. We excised a schwannoma on the nasal dorsum through direct incision and a schwannoma on the nasal tip through open rhinoplasty. No postoperative complications involving recurrence, hematoma, or infection occurred. The possibility of neurological changes should be considered in cases of an abnormality in the peripheral nervous system. Schwannoma must be kept in mind as a possible cause of neurological changes localized to a specific dermatome, and should always be considered in the differential diagnosis of a mass on the nose.

• Journal of Chest Surgery
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• v.22 no.3
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• pp.494-497
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• 1989

Schwannomas are rare and distinctive nerve sheath tumors. They occur commonly along the course of central and peripheral nerves, especially on the skin of the head, neck and extremities. Histologically, they are characterized by Antoni A and Antoni B tissues of high and low cellularity. 2 cases of intrapulmonary Schwannomas were reported worldwide by 1980. We report a case of twenty seven-year-old male patient with intrapulmonary Schwannoma, who had multiple nodules on the skin of the both upper extremities and scrotum with their characteristic findings.

• Journal of Korean Neurosurgical Society
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• v.30 no.sup1
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• pp.140-143
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• 2001

We report a case of huge trigeminal schwannoma in a 10-year-old boy with neurofibromatosis type II, extending into the three spaces of the left middle, posterior, and infratemporal fossa. Initially we thought the child had a solitary trigeminal schwannoma, and most of the mass was resected successfully through one-stage operation, cranio-orbito-zygomatic intradural approach. However during the follow-up of the patient we found radiographically other multiple intracranial tumors of bilateral acoustic schwannomas, right trigeminal schwannoma, and foramen magnum tumor. Eventually the patient was diagnosed as neurofibromatosis type II presenting multiple intracranial tumors. We think childhood trigeminal schwannoma, even though in the case of solitary tumor, should be considered as possible initial manifestation of neurofibromatosis type II and that careful follow-up for the possibility of occurrence of other brain tumors such as schwannomas or meningiomas is necessary.

• Journal of the Korean Society of Radiology
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• v.82 no.1
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• pp.194-200
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• 2021

Schwannomas originate from Schwann cells, and they are the most common benign neoplasms of the peripheral nerves. They can occur in most parts of the body but have a predilection for the head, the neck, and the flexor aspects of the extremities. Pancreatic schwannomas are uncommon, and only a few cases have been reported in the English literature. Approximately two-thirds of pancreatic schwannomas undergo cystic degeneration, and they should be considered in the differential diagnosis of solid pancreatic tumors with cystic changes to facilitate accurate diagnosis and optimal treatment. We report a case of a pathologically proven schwannoma in the pancreatic tail with multiple cystic and hemorrhagic changes followed by a review of relevant literature.

• Journal of the Korean Orthopaedic Association
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• v.54 no.1
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• pp.84-89
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• 2019

Schwannomas are benign neoplasms with a Schwann cell origin. A plexiform schwannoma is a rare variant of a schwannoma with a plexiform or multinodular growth pattern. The condition occurs mostly as a solitary lesion in the skin or subcutaneous tissue, or uncommonly located in the deep soft tissue. We report a rare case of recurred multiple plexiform schwannomas arising from the posterior tibial nerve and its branch, which was located in a deep anatomic location and accompanied by a bony deformity.

• Journal of Korean Neurosurgical Society
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• v.29 no.9
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• pp.1238-1242
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• 2000

Spinal schwannomas are usually extramedullary intradural tumors and their intramedullary localizations are thought to be extremely rare. A 60-year-old woman complaining spastic quadriparesis, voiding difficulty and dyspnea was admitted. Her cervical MRI revealed an intramedullary mass in the cervicomedullary junction with multiple cyst which extended from lower cervical to C3 spinal cord. The mass showed a low signal on T1WI, high signal on T2WI with an wall enhancement. The patient underwent a suboccipital craniectomy and C1-2 laminectomy and the cystic tumor was totally removed through a midline myelotomy. The tumor was proved as an intramedullary schwannoma by pathologic examination. The Intramedullary presence of a tumor arising from the cells of the nerve sheath is unusual, because the central nervous system fibers do not contain the Schwann cell. There have been several hypotheses, but none has been accepted universally. This rare tumor is considered as a curable benign neoplasm, and an accurate intraoperative diagnosis and surgically total removal are essential.

• Journal of Korean Neurosurgical Society
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• v.48 no.4
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• pp.383-387
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• 2010

Complete removal of three-compartment trigeminal schwannomas is a challenge to neurosurgeons. To expand exposure of each compartment, the combination and modification of skull base approaches are necessary. The 61-year-old woman was admitted with chronic headache. Preoperative magnetic resonance imaging showed $47{\times}50{\times}40\;mm$-sized tumor originating primarily in the middle cranial fossa extended to the posterior and the infratemporal fossa. We performed operation in five stage; 1. Zygomatic osteotomy, 2. Inferior temporal fossa plate removal and foramen ovale opening, 3. Cavernous sinus opening, 4. Tailored anterior petrosectomy, 5. Meckel's cave opening. Combination of skull base surgery should be concerned according to the patient. In this study, extradural basal extension with zygomatic osteotomy, interdural posterior extension with tailored anterior petrosectomy, and intracavemous exploration are reasonable options for remodeling three-compartment lesion into a single compartment. Tailoring of bone resection and exploring through natural pathway between meningeal layers accomplish single-stage operation for complete removal of tumors.

• Journal of Korean Neurosurgical Society
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• v.30 no.9
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• pp.1127-1129
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• 2001

The vast majority of schwannomas occur on cranial nerves, and rarely in the retroperitoneum. Solitary schwannoma in the psoas muscle is extremely rare. The authors present a case of retroperitoneal neoplasm in the psoas muscle identified as schwannoma which is not associated with von Recklinghausen's disease. A 68 years old female patient was admitted because of low back pain and weakness at the left leg. CT and MRI revealed a large cystic mass with well-defined margin and multiple internal septation within the left psoas muscle. The tumor was totally extirpated and histologically confirmed as a schwannoma.

• The Journal of the Korean bone and joint tumor society
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• v.11 no.1
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• pp.105-109
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• 2005

This journal reports three cases diagnosed with schwannomatosis in which no clinical symptoms of type 2 neurofibromatosis. The chief complain was pain. In adolescence and adult group, all masses were found. The locations were brachial plexus, popliteal fossa and hand. No hearing impairment, vertigo, tinnitus and visual disturbance was observed in any of the case. Family history was negative. In all cases, there was no evidence of vestibular schwannoma on cranial MRI imaging study. In all cases, Tinel sign was positive. Pathologic diagnosis was positive for schwannoma. Further study and case collection is needed to idenity the clinical manifestation, clinical course and genetic characteristic of schwannomatosis.