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Deceptively normal ventricular fluid in lymphomatous meningitis
1Department of Neurology, Beth Israel Hospital, Harvard Medical School, Boston, Mass.
Archives of Internal Medicine
|February 8, 1993
Summary
Diagnosing leptomeningeal cancer usually requires abnormal cerebrospinal fluid (CSF) cytology. This case shows normal ventricular CSF but abnormal lumbar CSF in relapsed leptomeningeal lymphomatosis, emphasizing site-specific sampling.
Area of Science:
- Neuro-oncology
- Cytopathology
- Neurosurgery
Background:
- Leptomeningeal cancer diagnosis relies on malignant cells in cerebrospinal fluid (CSF).
- Accurate diagnosis is crucial for timely and effective treatment of leptomeningeal disease.
Observation:
- A patient with relapsed leptomeningeal lymphomatosis presented with a diagnostic challenge.
- Cerebrospinal fluid obtained from the ventricle was cytologically normal.
- Cerebrospinal fluid collected via lumbar puncture showed abnormal malignant cells.
Findings:
- This case represents the first reported instance of normal ventricular CSF cytology with abnormal lumbar CSF cytology in leptomeningeal lymphomatosis.
- The discrepancy highlights potential limitations of sampling CSF distant from the suspected site of disease.
Implications:
- Clinical decisions for leptomeningeal cancer should consider the site of CSF sampling.
- Targeted CSF collection may improve diagnostic yield in cases of suspected leptomeningeal involvement.
- Further research into optimal CSF sampling strategies for leptomeningeal malignancies is warranted.