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Phaeochromocytoma and paraganglioma
1Department of Endocrinology, Royal Free Hospital, London, UK.
Bailliere'S Clinical Endocrinology and Metabolism
|April 1, 1993
Summary
Current analytical techniques, particularly HPLC-ECD for catecholamine estimation, offer high sensitivity and specificity for diagnosing catecholamine-secreting tumors. While older metabolite assays are becoming obsolete, urinary metanephrine remains a key diagnostic marker.
Area of Science:
- Endocrinology
- Clinical Chemistry
- Oncology
Background:
- Catecholamine-secreting tumors, such as pheochromocytoma, require accurate diagnostic methods.
- Traditional assays for catecholamine metabolites have limitations in sensitivity and specificity.
Purpose of the Study:
- To evaluate current analytical techniques for diagnosing catecholamine-secreting tumors.
- To highlight the advantages of HPLC-ECD over older methods.
Main Methods:
- High-performance liquid chromatography with electrochemical detection (HPLC-ECD) for plasma and urinary catecholamine estimation.
- Urinary metanephrine estimation.
- Suppressive tests (pentolinium suppression test), venous catheterization, and MIBG scanning for challenging cases.
Main Results:
- HPLC-ECD demonstrates superior diagnostic sensitivity and specificity for catecholamine estimation.
- Urinary metanephrine estimation is the preferred metabolite assay currently.
- Advanced techniques are necessary for diagnosing small lesions and early recurrences.
Conclusions:
- Modern analytical techniques like HPLC-ECD are poised to replace older assays for catecholamine-secreting tumors.
- Urinary metanephrine remains crucial for diagnosis until older methods are fully obsolete.
- A strategic diagnostic approach, including specialized tests, is essential for difficult cases.