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Primary extraskeletal osteosarcoma in the pineal region. Case report
Prajak Saesue1, Ekawut Chankaew, Orasa Chawalparit
1Division of Neurosurgery, Department of Surgery, Siriraj Hospital, Mahidol University, Bangkok, Thailand. sipas@mucc.mahidol.ac.th
Journal of Neurosurgery
|December 16, 2004
Summary
This report details a rare brain tumor, primary extraskeletal osteosarcoma, found in the pineal region. This case highlights a unique presentation and diagnosis of this uncommon central nervous system neoplasm.
Area of Science:
- Neuro-oncology
- Skeletal System Neoplasms
- Pathology
Background:
- Primary extraskeletal osteosarcoma is a rare malignant bone tumor that can occur outside the skeletal system.
- Intracranial extraskeletal osteosarcoma is exceptionally rare, with limited documented cases.
- This study focuses on a unique case within the pineal region of the brain.
Observation:
- A 45-year-old male presented with headache and diplopia, indicative of a potential intracranial mass.
- Imaging revealed a pineal region tumor causing obstructive hydrocephalus.
- Histopathological examination showed pleomorphic cells within an osteoid matrix, with vimentin positivity.
Findings:
- The tumor exhibited features consistent with extraskeletal osteosarcoma, distinct from glial, germ cell, epithelial, or lymphoid origins.
- Ultrastructural analysis revealed dilated rough endoplasmic reticula in tumor cells and characteristic osteoid matrix composition.
- Radiological and clinical data excluded a metastatic origin, confirming it as a primary intracranial tumor.
Implications:
- This case represents the first documented instance of primary extraskeletal osteosarcoma in the pineal region.
- It expands the known locations for this rare extraskeletal tumor.
- The findings contribute to understanding the diagnostic criteria and potential management of such rare brain neoplasms.