A synchronous occurrence of large bowel adenocarcinoma and extragenital malignant mixed mesodermal tumour (MMMT) is reported. This case represents the sixth extragenital MMMT reported in the literature.

This paper reports the pathological features of a diaphragmatic haemangiopericytoma with a discussion of diagnostic difficulties it may present in relation to other localised mesenchymal tumours of the pleura. The published reports of diaphragmatic haemangiopericytoma in the world english language literature are reviewed.