191 4 in. above his ankle. It seemed to be situated deeply in the muscles but was freely movable over the bone from side to side. It varied in consistency, parts appearing cystic and other parts hard. There was no pulsation either visible or on palpation. The posterior tibia1 artery was pulsating well. There was very definite wasting of the calf muscles, I in. difference as compared to the other leg. X rays revealed pressure indentation and erosion of the fibula, with minute areas of calcification in the soft tissues.
OPERATION.-A vascular dark-brown tumour was found implicating all muscles in the vicinity of the tumour. There was no capsule, and the tumour was so widespread that it was impossible to remove it in tota. An attempt was made to remove the margin. Portions were removed for section.
PATHOLOGICAL REPoRT.-spreading haemangioma with islets of chronic inflammation and heterotopic bone.
Sections of the growth show the structure of a haemangioma of the spreading type (Fig. 171). Foci of chronic inflammation and small islets of heterotopic bone are present in parts of the stroma.
Commentary.-In view of the rarity of these cases it seems of interest to report this example. It was impossible to state definitely from which muscle the tumour had arisen, though probably it was the peroneus longus.