A system of surgery . andoften absent, and theconverse of this isequally true. It hasbeen urged that com-plicated sarcomataof glands should rankas a separate genus,but the convenienceand justice of keepingthem among sarco-mata is indicated bythe fact that when amyosarcoma is re-moved and recurs,the recurrent tumourcontains only roundand spindle - calledelements. The general characters of sarcomata.—It will now be ne-cessary to refer to the characters of sarcomata in general. The blood supply.—The vascularity of sarcomata varies all the circulation is mainly capillary. In the small r
A system of surgery . andoften absent, and theconverse of this isequally true. It hasbeen urged that com-plicated sarcomataof glands should rankas a separate genus,but the convenienceand justice of keepingthem among sarco-mata is indicated bythe fact that when amyosarcoma is re-moved and recurs,the recurrent tumourcontains only roundand spindle - calledelements. The general characters of sarcomata.—It will now be ne-cessary to refer to the characters of sarcomata in general. The blood supply.—The vascularity of sarcomata varies all the circulation is mainly capillary. In the small round-celledspecies the vessels may be so numerous as to cause distinct pulsationand a loud murmur or hum. The slow-growing spindle-celledspecies are poor in vessels. In tumours, which grow rapidly, thewalls of the blood-vessels are very thin, and rupture from the forceof the circulation, converting the centre of a sarcoma into a bloodcavity. Tumours thus transformed were formerly described asmalignant blood Fig. 116. Lymphosarcoma of the Mediastinum infiltrat-ing the Lung. 472 TUMOURS. Infiltrating properties. — In some instances sarcomata arefurnished—at least, in their early stages—with a capsule, butthe majority are unencapsuled, and extensively infiltrate the planesof connective tissue adjacent to the tumour. This infiltratingtendency comes out well when a sarcoma starts within the sheath ofa muscle, for it will dissociate the fasciculi and extend throughout the muscle, transformingit into a hard induratedmass. Retinal sarcomata,after escaping from theeyeball, infiltrate the ocu-lar muscles, and periostealsarcomata infiltrate theadjacent muscles, andrender it impossible todetermine the real limitsof the tumours, especiallywhen seated in the , aris-ing in the mediastinum,illustrate the disastrouseffects of infiltration (). Dissemination. —Sar-comata are liable to re-produce themselves indistant parts. The mostusual organ in wh
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