• Clinics in Shoulder and Elbow
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• v.17 no.4
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• pp.181-184
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• 2014

Schwannomas are soft tissue sarcomas arising from neurilemma of Schwann cells in peripheral nerves, and is the most frequent type of benign tumor found in these nerves. We report a case of a Schwannoma of the ulnar nerve in the elbow joint, and along this report, give a review of the literature. A 46-year-old male patient was hospitalized with complaints of swelling and pain in the left elbow and a tingling sensation and hypoesthesia of the fourth and fifth fingers. Physical examination of the patient showed he was positive for Tinel's sign, and magnetic resonance imaging results demonstrated the presence of a Schwannoma. Subsequent biopsy and excision of the Schwannoma was carried out. The suspected mass, which had a clear margin separating it from the healthy nerve of the medial left elbow, was removed along with its $2{\times}2{\times}3cm$ capsule after a histological diagnosis of a Schwannoma was made. Pathophysiological results confirmed the excised mass as a Schwannoma. Schwannoma of the ulnar nerve within the elbow joint is rare and differential diagnosis is difficult. Therefore, treatment can only proceed after the presence of Schwannoma has been confirmed by physical and radiological examinations.

• Archives of Plastic Surgery
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• v.38 no.4
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• pp.494-497
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• 2011

Purpose: Schwannoma, a benign peripheral nerve tumor, is slow-growing, encapsulated neoplasm that originates from the Schwann cell of the nerve sheath. Schwannoma most frequently involves the major nerve. Schwannoma occurring in the superficial radial nerve rare. This is a report of our experience with schwannoma arising from the superficial radial nerve with neurologic symptom. Methods: A 55-year-old woman presented with eight-month history of progressive numbness and paresthesia in dorsum of the thumb and index finger. Physical examination revealed a localized mass on the midforearm. Sonographic examination showed an ovoid, heterogenous, hypoechoic lesion, located eccentrically in related to the superficial radial nerve. The lesion was mobile in the transverse but not in the longitudinal axis of the nerve, which was thought to favour schwannoma rather than neurofibroma. At operation, a $20{\times}15mm$ ovoid, yellowish grey mass was seen arising from the superficial radial nerve. The tumor present as eccentric masses over which the nerve fibers are splayed. Using operating microscope, the tumor was removed, preserving the surrounding nerve. Results: Histology confirmed that the mass was a benign schwannoma. There were no postoperative complications. After two months the patient had no clinically demonstrable sensory deficit. Conclusion: An unsusual case of a schwannoma of the superficial radial nerve is presented. In case with neurologic symptom, prompt surgical decompression must be made to prevent further nerve damage and to restore nerve function early.

• The Journal of the Korean bone and joint tumor society
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• v.12 no.1
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• pp.89-94
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• 2006

When the old schwannoma has the degenerative changes, it is named as the ancient schwannoma which was rarely reported. The degenerative changes are perivascular hyalinization, calcification, cystic necrosis, marked decrease of Antoni type A area, and degenerative nuclei and the ancient schwannoma may be misinterpreted as sarcomatous pleomorphisms. We experienced the ancient schwannoma which has massive hemorrhage and hematoma, cystic change, calcification, and marked decrease of Antoni A area in leg on 75 year old male patient, and report it.

• Korean Journal of Head & Neck Oncology
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• v.23 no.2
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• pp.192-194
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• 2007

Schwannoma, also named neurilemmoma, is a rare solitary and slow-growing tumor which originates from schwann cells of the nerve sheath. Schwannoma is a well-circumscribed, encapsulated masses that is attached to the nerve but can be separated from it. On microscopic examination, tumors show a mixture of two growth patterns, Antoni A and B. Surgical excision is the treatment of choice. Especially, Schwannoma of the tongue is very rare. We present a case of a 11-year-old child with a schwannoma of the tongue, measuring $1{\times}1cm$. During the operation the mass revealed itself as being encapsulated. The tumor was removed and diagnosed pathologically as a schwannoma.

• Archives of Craniofacial Surgery
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• v.19 no.3
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• pp.231-234
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• 2018

A schwannoma is a benign tumor that develops from Schwann cells. It is known to occur more frequently in women than men, and about one third of schwannoma cases occur in the head and neck area. It is also known to originate mainly in the auditory nerve. However, it is rarely associated with the trigeminal nerve, and especially, schwannomas related to the infraorbital nerve are very rare. we report a rare case of a schwannoma involving the infraorbital branch of the trigeminal nerve in a 45-year old male adult. The patient underwent physical examination and magnetic resonance imaging. The mass was approached through subciliary approach that is familiar to the plastic surgeon and completely resected. Histopathological findings showed pointed to a benign schwannoma. Infraorbital nerve schwannoma is difficult to distinguish from other diseases by means of clinical symptoms, physical findings, or imaging. In spite of its rarity, infraorbital nerve schwannoma may be considered a possible diagnosis in the case of mass on cheek. Assessment by computed tomography or magnetic resonance imaging is necessary for proper diagnosis. About the surgical approach, excision through the subciliary approach should be considered rather than the direct transfacial approach in view of stability, cosmetic effects, and familiarity.

• Journal of Korean Neurosurgical Society
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• v.30 no.sup2
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• pp.328-331
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• 2001

Trigeminal schwannoma is an uncommon intracranial tumor and constitutes less than 0.08-8% of all intracranial schwannoma. Trigeminal shchwannoma is even rarer in childhood and only 11 cases of trigeminal schwannoma under the age of 14 have been reported including our case. We experienced a case of trigeminal schwannoma in a 9 year-old girl without the stigmata of neurofibromatosis. She presented with a 2 week-history of right abducens nerve palsy. Magnetic resonance image demonstrated a dumbbell-shaped tumor extending into right middle and posterior fossas with a size of $60{\times}45{\times}35mm$. The tumor was successfully removed by right transzygomatic subtemporal extradural approach. Pathologic examination of the mass revealed typical features of schwannoma.

• Journal of Chest Surgery
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• v.47 no.2
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• pp.141-144
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• 2014

We present a case of a 55-year-old woman who complained of chest pain at rest. A mass was detected adjacent to her left atrium. The mass was completely excised, and a pathologic examination revealed it to be a schwannoma. Schwannomas are tumors that originate in the nerve sheath and are rarely detected in the heart. Here, we describe a rare case of primary schwannoma of the left atrium.

• Journal of Korean Neurosurgical Society
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• v.37 no.3
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• pp.228-231
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• 2005

We describe a rare case of 52-year-old woman with lumbar schwannoma associated with hydrocephalus. In our case, the signs and symptoms of intracranial hypertension were not resolved even after the complete removal of the lumbar schwannoma. We also reviewed the literature on the association of hydrocephalus with spinal cord tumor.

• Archives of Plastic Surgery
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• v.38 no.6
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• pp.890-893
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• 2011

Purpose: Schwannoma is a slow-growing, encapsulated benign peripheral nerve tumor that originates from the Schwann cell of the nerve sheath. Schwannoma most frequently involves the major nerve. Schwannoma of the foot is rare. This is a report of our experience with a small, deep-seated, and non-palpable schwannoma occurring in the foot. Methods: A 42-year-old woman presented with the plantar pain of the right foot during 2 years. Physical examination did not identified a palpable mass. She made a clinical diagnosis of plantar fasciitis and was conservatively treated 2 years ago. Since her plantar foot pain was aggravated, she was recently visited again. For the evaluation of her plantar foot pain, sonographic examination of the whole right foot was performed, and it revealed a small hypoechoic hetergenous, deep-seated mass beneath the plantar aponeurosis. At operation, a $0.7{\times}0.6{\times}0.4$ cm sized, ovoid, yellowish grey mass was removed. Results: Histology was confirmed that the mass was a benign schwannoma. There were no postoperative complications. Conclusion: Unsusual case of a schwannoma with the plantar foot pain during 2 years is presented. It should be recognized a small, deep-seated, non-palpable

• The Korean Journal of Cytopathology
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• v.10 no.1
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• pp.55-60
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• 1999

Schwannoma is a benign encapsulated nerve sheath tumor and is histologically characterized by a mixture of Antoni type A and B tissue. A preoperative diagnosis of schwannoma by fine needle aspiration cytology or by any other means is important a preserve clinically important nerves. Therefore, it is necessary to make a specific cytological diagnosis of nerve sheath tumor. However, there are a few reports regarding cytological features of schwannoma in Korea. We experienced seven cases of solitary schwannoma and here we report their characteristic cytological features with a review of literatures. The characteristic features of schwannoma on cytology were the presence of both Antonl type A and B tissue. The cytologic findings common to all cases of schwannoma generally corresponded to the histologic findings of Antoni type A tissue, consisting of fragments of tightly cohesive fascicles with variable cellularity. Dense fibrillary substances were found, along with palisading nuclei and Verocay bodies. Individual tumor cells consisted of cohesive cells haying spindle or oval nuclei, with pointed ends and Indistinct cell borders. Variation in nuclear size and shape was also present. The Antoni type B consisted of scattered wavy or short spindle cells and some histiocytes and lymphocytes in the abundant myxoid background with formation of microcysts. Immunohistochemistry for S-100 protein revealed a uniformly strong positive reaction and was helpful to make more accurate diagnosis of schwannoma.