Abstract
The points which have emerged from studying this series of cases are: 1. Radiotherapy has a place of some importance in the treatment of carcinoma of the thyroid when complete surgical excision cannot be carried out. 2. Papillary adenocarcinoma will respond and in some cases clinical disappearance can be obtained by external irradiation, but needs high dosage. The slow evolution and local nature of papillary adenocarcinoma until a late stage makes attempted surgical removal desirable whenever possible. External irradiation should be used whenever macroscopic disease is left behind. 3. Alveolar adenocarcinoma does not regress completely after external irradiation, even with such high dosage, except for some of the less well-differentiated forms. External irradiation is useful in alveolar adenocarcinoma as a palliative measure and may render metastases quiescent for some years. 4. Undifferentiated carcinoma responds to external irradiation in about 50 per cent of cases. Five-year survivals can be obtained i...

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