[Soft tissue tumors of the lung and pleura].

We present two patients with lung and pleura soft tissue tumours. A 37 year-old man had a small, highly malignant tumour which had invaded the mitral valve. The presenting symptom was mitral stenosis. The tumour was classified as a leiomyosarcoma. A 65 year-old female had a large tumour, which was most probably a solitary fibrous mesothelioma. Hypoglycaemia was evident. Insulin-like growth factor I was produced by tumour cells, although the hormone was not found in the plasma.