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Distribution of brain metastases.
J Y Delattre1, G Krol, H T Thaler
1Department of Neurology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021.
Archives of Neurology
|July 1, 1988
Summary
Brain metastasis patterns vary by primary tumor location. Pelvic and gastrointestinal cancers show a higher incidence of posterior fossa metastases, suggesting unique spread mechanisms beyond simple arterial embolization.
Area of Science:
- Neuro-oncology
- Radiology
- Pathology
Background:
- Brain metastases are a common complication of cancer.
- Understanding the distribution patterns of brain metastases is crucial for diagnosis and treatment.
- Computed tomography (CT) scans are a primary tool for identifying and characterizing brain metastases.
Purpose of the Study:
- To analyze the frequency and anatomical distribution of brain metastases.
- To investigate the relationship between primary tumor site and the location of brain metastases.
- To explore potential mechanisms for the observed distribution patterns.
Main Methods:
- Retrospective analysis of CT scans from 288 patients with brain metastases.
- Categorization of metastases by number and location (hemispheral, posterior fossa).
- Correlation of metastasis patterns with primary tumor origin (pelvic, gastrointestinal, other).
Main Results:
- Single brain metastasis occurred in 49% of patients.
- Posterior fossa involvement was significantly higher (50%) in patients with pelvic or gastrointestinal primary tumors compared to others (10%).
- Hemispheral metastases predominantly occurred in arterial watershed areas, suggesting microemboli lodging.
Conclusions:
- The distribution of brain metastases, particularly subtentorial lesions in pelvic/gastrointestinal cancers, is not solely explained by arterial embolization.
- Alternative or additional mechanisms, potentially not involving Batson's plexus, may contribute to the unique metastatic patterns observed.