IN-111-OCTREOTIDE AND TC-99M(V)-DIMERCAPTOSUCCINIC ACID STUDIES IN THE IMAGING OF RECURRENT MEDULLARY-THYROID CARCINOMA

Detection of recurrence from medullary thyroid carcinoma (MTC) remains a diagnostic problem, especially when increased serum tumour marker levels suggest recurrence and conventional imaging techniques are non-diagnostic. In this study, we performed In-111-octreotide and Tc-99m(V)-dimercaptosuccinic acid (DMSA) scans in a series of eleven patients with MTC presenting with elevated serum tumour markers after surgery. In-111-octreotide whole body studies detected tumour in six of the eleven patients studied and detected nine tumoral localizations. Tc-99m(V)-DMSA whole body studies detected tumour in five of the eleven patients studied and eight tumoral localizations. In-111-octreotide and Tc-99m(V)-DMSA studies detected recurrence in all four patients with basal calcitonin levels above 1000 ng/l. We conclude that In-111-octreotide and Tc-99m(V)-DMSA studies have limited sensitivity to detect recurrence in patients with MTC, although their sensitivity may improve with high serum calcitonin levels. These radionuclide imaging techniques should be employed when conventional imaging techniques are negative or inconclusive or, in the case of In-111-octreotide studies, should be employed when we want to investigate the presence of somatostatin receptors that provide the basis for treatment with somatostatin analogues.