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Intracranial schwannoma presenting as a subfrontal tumor: case report
P P Huang1, D Zagzag, V Benjamin
1Department of Neurosurgery, New York University Medical Center, New York, USA.
Objective And Importance:
Intracerebral schwannomas not associated with cranial nerves account for less than 1% of surgically treated schwannomas of the central and peripheral nervous system. Subfrontal schwannomas are extremely rare, with only 15 cases reported to date.
Clinical Presentation:
A 33-year-old man presented with a 4-month history of progressive headaches and lethargy. Radiographic studies revealed a large subfrontal tumor thought to be a meningioma preoperatively.
Intervention:
The patient underwent a craniotomy for resection of his tumor. Intraoperatively, a large extra-axial tumor arising from the floor of the left frontal fossa was encountered.
Conclusion:
Microscopic examination of the tumor revealed a schwannoma. Several theories on the possible origin of intracerebral schwannomas have been considered. Because of the age of the patient at presentation, many authors have postulated a developmental origin for these lesions. However, extra-axial schwannomas not associated with cranial nerves often present later in life, suggesting a different pathogenesis for this subgroup.
