[Paraneoplastic syndromes affecting the nervous system and the musculature associated with malignant tumours of the thyroid gland (author's transl)].

Two cases are presented of the paraneoplastic syndrome in patients with a malignant tumour of the thyroid gland. The first case presented with a pseudomyasthenic syndrome (in conjunction with a haemangio endothelioma) and the second case with a form of neuromyopathy (in conjunction with a partly solid and partly hormone-producing thyroid carcinoma). The pathogenesis and classification of the so-called carcinomatous neuropathies is briefly outlined and the initially atypical course taken by the first case is discussed.