This article describes two cases of female patients who fell ill with thyroid cancer and malignant lymphoma. In the first case, the skin form of non-Hodgkin lymphoma in the left breast was diagnosed. The tumour was excised and the site was treated with radiotherapy at a total dose of 40 Gy. Seven years later the thyroid carcinoma appeared of probable radiogenic origin. A total thyroidectomy and I3II therapy were performed. Both malignancies are currently in long-term remission. In the second case, a thyroid cancer was first documented. Long-term remission was achieved through the standard procedure of thyroid cancer treatment (surgery and I311 therapy). Eight years later enlarged neck lymph nodes appeared as the first sign of Hodgkin disease. Despite two years of haematological therapy the patient died.

        Key words: thyroid cancer, Hodgkin disease, non-Hodgkin lymphoma.