The diagnosis of phaeochromocytoma is dependent on combined biochemical and radiological investigation, the biochemical studies being performed initially and followed later by both non-invasive and invasive radiological techniques. In 23 patients studied, a selection of biochemical studies allowed diagnosis and accurate localization of phaeochromocytoma in 16. In some patients, tumour localization was confirmed by radiographic methods. Biochemical estimations of catecholamines and/or metabolites in urine and/or plasma were also performed during and after operation, and these measurements allowed monitoring of the completeness of tumour excision, and of the possibility of recurrence, in both the short term and the long term follow up of patients.
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