2. Tumours occur in the thymus gland in approximately 13% of
patients suffering from myasthenia gravis.3. Some of these tumours are probably present for some years
before myasthenic symptoms occur.4. So far as can be ascertained, these tumours are only
locally malignant, deposits being confined to the mediastinum and
pleura, and rarely within the lung.5. Seventeen cases of thymic tumour in myasthenia gravis are reported, three of which have metastasised locally, i.e. 18%.6. A special radiological technique has been developed to
demonstrate fully the various types of these thymic tumours.1. It appears that many cases previously reported as being
malignant tumours of the thymus are probably secondary tumours
