Intraventricular neurocytoma with prominent myelin figures

Area of Science:

• Neuropathology
• Neuro-oncology
• Cellular Biology

Background:

• Intraventricular neurocytomas are rare tumors typically arising from the septum pellucidum.
• Understanding the cellular origins and differentiation pathways of these tumors is crucial for accurate diagnosis and treatment.

Observation:

• A case of intraventricular neurocytoma presented with distinctive intracytoplasmic concentric lamellar structures on light microscopy.
• These structures mimicked myelin sheaths and showed eosinophilic cores on H&E staining.
• Immunohistochemistry revealed reactivity for synaptophysin and neurofilament, but not glial fibrillary acidic protein.

Findings:

• Electron microscopy confirmed features of neurocytoma, including neurosecretory granules and neurotubules.
• The prominent lamellar structures were consistent with ultrastructural findings.
• The tumor's immunophenotype and ultrastructure suggest a potential dual differentiation.

Implications:

• This case expands the known morphological spectrum of intraventricular neurocytoma.
• The findings may indicate a progenitor cell capable of differentiating into both neuronal and glial lineages.
• Further research into the pathogenesis of such tumors could inform therapeutic strategies.