Schwannomas are benign nerve sheath tumors that can originate at any anatomic sites. These tumors are usually soitary, benign, and slow-growing masses attached to large nerve trunks. These tumors have been described as arising in the pelvic retroperitoneum. We present two cases of pelvic retroperitoneal Schwannomas with a brief review of literatures.
Nerve Sheath Neoplasms ; Neurilemmoma*

No abstract available.
Brachial Plexus* ; Nerve Sheath Neoplasms*

Nerve sheath tumors of genitourinary tract are a rare and sometimes have challenging problems. Neurofibroma is a benign tumor characterized by diffuse proliferation of peripheral nerve elements. It rarely occurs in the retroperitoneal region. Although neurofibroma may occur as a solitary lesion, its common manifestation is in the syndrome of neurofibromatosis with a variable clinical Herein we report a case of giant retroperitoneal neurofibroma and review the subject briefly.
Nerve Sheath Neoplasms ; Neurofibroma* ; Neurofibromatoses ; Peripheral Nerves

The schwannoma is a benign neoplasm originating from Schwann cell. Solitary nerve sheath tumors such as benign schwannomas arising in the pelvic retroperitoneum are infrequently reported. Those tumors can indeed be misdiagnosed for other more common conditions both clinically and instrumentally. We report a very rare case of a benign retroperitoneal pelvic schwannoma of the obturator fossa, which was incidentally found and misdiagnosed as adnexal mass preoperatively in fifty one-years-old postmenopausal women.
Female ; Humans ; Nerve Sheath Neoplasms ; Neurilemmoma*

Malignant peripheral nerve sheath tumors (MPNSTs) are very rare tumors. We experienced a case of MPNST in the cervical paraspinal space which was not associated with neurofibromatosis. The tumor located in left C6-7 foramen and compressed C7 root. The tumor was removed through the occipital triangle. We report a case of the primary cerivcal MPNST in a patient who did not have neurofibromatosis-1.
Humans ; Nerve Sheath Neoplasms ; Neurofibromatoses ; Peripheral Nerves

Neurilemmomas are benign tumors of the nerve sheaths. They are usually painless and are most common in the upper extremities. Pathologically, neurilemmoma is encapsulated and made up of organized element: the Antoni A cells, the Antoni B cells and the Verocay bodies. According to Stout, neurilemmomas never become malignant. Two cases of neurilemmoma of tibial nerve and One case of neurilemmoma of lateral antebrachial cutaneous nerve are presented with a review of the literature. Tumors were enucleated and confirmed by pathological examination.
B-Lymphocytes ; Nerve Sheath Neoplasms ; Neurilemmoma ; Tibial Nerve ; Upper Extremity

Schwannomas are benign nerve sheath tumors composed of Schwann cells, which normally produce the insulating myelin sheath covering the peripheral nerves. Common locations include the head, neck, mediastinum, and retroperitoneum. These tumors are usually asymptomatic until they become large and compress the surrounding tissues. Most schwannomas occur during the third and fourth decades of life, with an equal gender distribution. We present the case of a schwannoma that originated in the scrotum.
Head ; Mediastinum ; Myelin Sheath ; Neck ; Nerve Sheath Neoplasms ; Neurilemmoma* ; Peripheral Nerves ; Schwann Cells ; Scrotum*

We describe two rare cases of sequestered disc herniation which mimicked benign nerve sheath tumors radiologically. It is often quite difficult to differentiate a sequesterded disc from an extradural tumor when the discal fragments are migrated away from the origin. Distinguishable features of clinical and radiological characteristics between sequestered discs and benign intraspinal tumors were disscused. Although a well enhancing spherical mass in the spinal canal is routinely diagnosed as tumors, a free sequestered disc fragment also should be taken into consideration if the mass shows peripheral enhancement accompanied with degenerative spinal changes on MRI.
Magnetic Resonance Imaging ; Nerve Sheath Neoplasms ; Spinal Canal

Malignant peripheral nerve sheath tumors (MPNSTs) have rarely been reported to occur in the adrenal gland and all of the reported cases were associated with neurofibromatosis, pheochromocytoma or ganglioneuroma. We present here a case of MPNST in the bilateral adrenal glands without any history of neurofibromatosis or combined tumor. Histologic examination showed the tumor cells had a spindle to ovoid shape, they were arranged in sweeping fascicles and there were frequent mitotic figures. The immunohistochemical and ultrastructural features of the tumor are also presented. To the best of our knowledge, this is the first report in the English medical literature about MPNSTs in the bilateral adrenal glands without any history of neurofibromatosis or combined tumor.
Adrenal Glands ; Ganglioneuroma ; Nerve Sheath Neoplasms ; Neurofibromatoses ; Pheochromocytoma

Nerve sheath tumors are not frequent in the head and neck area. They might arise from large or small units of cranial, cervical and brachial plexuses as well as the cervical symphatic nerves. Their clinical course and findings are not similar, and preoperative diagnosis are extremely difficult in some cases. We experiencd eighteen cases of extracranial nerve sheath tumors in the head and neck regions during the past six years Twelve of them were schwannomas, and six of them were neurofibromas which did not associate with Von Recklinghausen's diseases. This analysis of eighteen cases and two representative cases are reported with literature review.
Brachial Plexus ; Diagnosis ; Head* ; Neck* ; Nerve Sheath Neoplasms* ; Neurilemmoma ; Neurofibroma