Squamous cell carcinoma developing in an intracranial prepontine epidermoid cyst

Area of Science:

• Neurology
• Oncology
• Pathology

Background:

• Intracranial epidermoid cysts are rare tumors, accounting for 0.2-1% of all brain tumors.
• Malignant transformation of these benign lesions is exceptionally rare.

Observation:

• A 66-year-old male presented with confusion, and MRI revealed a heterogeneous signal lesion anterior to the pons with ventricular dilatation.
• Cerebrospinal fluid analysis showed inflammatory cells.
• Autopsy revealed a tumor encasing the basilar artery, with microscopic examination confirming well-differentiated epidermoid carcinoma arising from a cystic lesion.

Findings:

• The tumor walls were lined by squamous epithelium, and carcinomatous cells lined the ventricles.
• No leptomeningeal metastasis was observed.
• This represents one of approximately 23 reported cases of malignant transformation of intracranial epidermoid cysts.

Implications:

• Malignant transformation of intracranial epidermoid cysts, though rare, carries a poor prognosis, with most patients dying within months.
• This case underscores the importance of vigilance for malignant change in intracranial epidermoid cysts.
• Further research into the mechanisms and treatment of this rare oncological entity is warranted.