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Abstract:
The central midline location of the pineal gland, its intricate contact with cerebrospinal fluid pathways, and the generally large size of tumors in this area before they produce symptoms raise problems in the use of TNM classification. Biopsy was performed on 30 consecutive pineal region tumors seen in children detected over an 8-year period. The pathologic features did not conform to previous autopsy data. Germinomas comprised only 7% of tumors, whereas 23% were malignant germ cell tumors. Neither computerized tomography, magnetic resonance imaging scan, nor markers were shown to be diagnostic of pathologic type. It was concluded that the significant factors affecting outcome are tumor cell type and presence or absence or mitoses. Surgical biopsy is recommended for all pineal region tumors in children. At the current time, the data base is insufficient to devise a staging classification specific for pineal region tumors and the TNM system appears largely inappropriate. Thus, it is reasonable to develop a data base for tumors of this region that then may lead to a specific staging system.
Insights
Pineal region tumors in children require surgical biopsy for accurate diagnosis, as imaging and markers are unreliable. Tumor cell type and mitoses significantly impact outcomes, necessitating a dedicated staging system.
Area of Science:
- Pediatric neuro-oncology
- Neurosurgery
- Pathology
Background:
- Pineal region tumors present diagnostic challenges due to location and size.
- The TNM classification system is often inappropriate for these tumors.
- Previous autopsy data may not reflect current diagnostic findings.
Purpose of the Study:
- To evaluate the pathological features of pediatric pineal region tumors.
- To assess the diagnostic utility of imaging and tumor markers.
- To determine factors influencing patient outcomes and the need for a specific staging system.
Main Methods:
- Surgical biopsy of 30 consecutive pineal region tumors in children over 8 years.
- Pathological examination of tumor specimens.
- Correlation of pathological findings with clinical data.
Main Results:
- Pathological features varied from previous autopsy data.
- Germinomas represented 7% of tumors; malignant germ cell tumors were 23%.
- Computerized tomography, MRI, and markers were not diagnostic of tumor type.
Conclusions:
- Tumor cell type and presence of mitoses are critical for predicting outcomes.
- Surgical biopsy is essential for accurate diagnosis of pediatric pineal region tumors.
- A dedicated staging system for pineal region tumors is needed due to the inadequacy of the TNM system.