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Updated: Mar 4, 2026
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Primary Culture of Human Vestibular Schwannomas
Published on: July 20, 2014
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Pediatric Non-vestibular Schwannoma
Cory Broehm1, Alyaa Al-Ibraheemi1, Karen J Fritchie1
11 Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA.
Summary
Pediatric non-vestibular schwannomas (NVS) are typically benign, showing retained SMARCB1/INI1 expression. Awareness of their cellularity and mitotic rate is crucial for accurate diagnosis in children.
Area of Science:
- Pediatric Pathology
- Oncology
- Neurosurgery
Background:
- Vestibular schwannomas in children, often linked to neurofibromatosis type 2 (NF2), are well-documented.
- Limited data exists on pediatric non-vestibular schwannomas (NVS) and their SMARCB1/INI1 expression patterns.
Purpose of the Study:
- To characterize the clinicopathologic features of pediatric NVS.
- To evaluate the SMARCB1/INI1 protein expression in pediatric NVS.
Main Methods:
- Retrospective review of institutional archives for NVS in patients 18 years or younger.
- Assessment of clinicopathologic features and SMARCB1/INI1 status for each case.
Main Results:
- Twenty-three pediatric NVS were identified across various locations (paraspinal, head/neck, extremities, etc.).
- All 23 tumors demonstrated retained nuclear SMARCB1/INI1 expression.
- Tumors were predominantly Antoni A type, with some showing high mitotic rates (≥4/10 HPFs) but lacking other atypical features.
Conclusions:
- Pediatric NVS exhibit a generally homogeneous appearance, predominantly Antoni A areas.
- Retained SMARCB1/INI1 expression is a consistent finding in pediatric NVS.
- Pathologists must recognize potential cellularity and mitotic activity in pediatric NVS to prevent misdiagnosis as sarcoma.
