Schwannoma
Synonyms/Description
Schwann cell tumor
Etiology
Schwannomas are peripheral nerve sheath tumors composed of Schwann cells, which produce myelin that covers and insulates nerve fibers. Schwannomas can occur in isolation or may be associated with neurofibromatosis type I (previously known as von Recklinghausen’s disease).
Nerve sheath tumors can occur anywhere along the peripheral nervous system, with only 3% of Schwannomas arising in the retroperitoneum and pelvis. Retroperitoneal Schwannomas tend to be very large when detected because they are usually asymptomatic or associated with nonspecific symptoms, thus delaying diagnosis. Malignant peripheral nerve sheath tumors are even more rare and are classified as sarcomas.
Ultrasound Findings
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