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Hypoglycorrhachia in leptomeningeal carcinomatosis. A pathophysiological study
S Jann1, A Comini, G Pellegrini
1Clinica Neurologica II, Università di Milano.
Italian Journal of Neurological Sciences
|February 1, 1988
Summary
This study investigated unexplained low cerebrospinal fluid (CSF) glucose in a patient with leptomeningeal carcinomatosis. Findings suggest abnormal glucose transport, not tumor metabolism, causes this hypoglycorrhachia.
Area of Science:
- Neurology
- Oncology
- Biochemistry
Background:
- Leptomeningeal carcinomatosis (LC) presents diagnostic challenges, especially when the primary tumor is occult.
- Cerebrospinal fluid (CSF) analysis is crucial for diagnosing LC, with glucose levels often monitored.
Observation:
- A patient with diagnosed LC exhibited persistently low CSF glucose (hypoglycorrhachia) despite extensive investigations.
- Diagnostic evaluation included intravenous glucose loading to elucidate the mechanism of hypoglycorrhachia.
Findings:
- CSF glucose levels did not rise following intravenous glucose infusion, indicating impaired glucose transport into the CSF.
- CSF lactic acid levels remained high basally and were not further elevated by glucose loading.
- These results exclude increased glucose utilization by neoplastic cells as the cause of hypoglycorrhachia.
Implications:
- The findings suggest that impaired glucose transport across the blood-CSF barrier, rather than neoplastic cell metabolism, is responsible for hypoglycorrhachia in this LC patient.
- This highlights a potential mechanism for altered CSF metabolism in leptomeningeal carcinomatosis.
- Further research into glucose transport mechanisms in the central nervous system is warranted.