[Studies on small thyroid carcinoma in dialysis patients with hyperparathyroidism]

For twenty long-term hemodialysis patients with medically uncontrolled hyperparathyroidism, subtotal parathyroidectomy (PTX) was performed and histological examination was done for 17 out of them, suspected of thyroid disease from operative findings. Thyroid carcinomas were found in 5 out of 17 patients by biopsied specimens of thyroids. Histological findings of carcinomas were follicular (2 cases) and papillary types (3 cases). In all cases, carcinomas were in occult state and the sizes of carcinomas of 4 cases were small being a diameter less than 10 mm. Among others, findings of follicular adenoma (2 cases) and chronic thyroiditis (1 case) were obtained. The incidence rate of thyroid carcinoma in this report seemed to be rather high as the incidence diagnosed from biopsied specimen at operation. Several factors such as immunological incompetence accompanied by renal failure, metabolic abnormalities of cells induced by parathyroid dysfunction and accelerated aging are considered to be involved as a cause of increased incidence of thyroid carcinoma in hemodialysis patients with hyperparathyroidism.