The authors describe a mesenchymal rapidly progressing chondrosarcoma in the shoulder area, despite the fact that is was histologically classified only as a IInd grade malignity. Within one year after radical resection treatment with amputation of the upper extremity it relapsed and seconda- ries developed in the lungs. The tumour was quite resistant to chemotherapy. Attention is drawn to the rare occurrence of this type of chondrosarcoma (only about 1% of total) and the authors give a review of the literature on diagnosis and structure.

        Key words: mesenchymal chondrosarcoma - malignant soft tissue tumours - diagnostic imaging of malignant tumours of the locomotor apparatus