. Tumours, innocent and malignant; their clinical characters and appropriate treatment. ting them : it is by no means unusual in a sectionof a large mediastinal sarcoma to find bronchial lymph-glandsfully charged with pigment embedded in the tumour (Fig. 40).Some writers are of opinion that lympho-sarcomas of thesuperior mediastinum arise in the thymus. This, of course,is possible, but it is very difficult of proof. The infiltrating power of sarcomas may be studiedwhen they invade the sheath of a muscle. For instance,when a retinal sarcoma protrudes through the scleroticand invades the orbit i
. Tumours, innocent and malignant; their clinical characters and appropriate treatment. ting them : it is by no means unusual in a sectionof a large mediastinal sarcoma to find bronchial lymph-glandsfully charged with pigment embedded in the tumour (Fig. 40).Some writers are of opinion that lympho-sarcomas of thesuperior mediastinum arise in the thymus. This, of course,is possible, but it is very difficult of proof. The infiltrating power of sarcomas may be studiedwhen they invade the sheath of a muscle. For instance,when a retinal sarcoma protrudes through the scleroticand invades the orbit it sometimes makes its way into thesheaths of the recti, and converts them into massesresembling yellow wax. On microscopic examination the F ee GONNEGTIVE-TISSJJE TUM0VR8 various fasciculi will be found isolated by tbe cells of thesarcoma. Periosteal sarcomas often invade muscles, andthis is easily comprehended when the intimate relations ofmuscles to periosteum are remembered. Burrowing tendencies of sarcomas. — All tumoursin their growth tend to follow the lines of least resist-. Fig. 40.—Portion of a mediastinal lympho-sarcoma, to show the manner in whichthe tumour extends along the bronchi and pulmonary vessels. ance, and thus enter into nooks and crannies in the mostunexpected manner. Every surgeon knows how a sarcomaof the maxilla will send processes into the spheno-maxillary fossa and creep through the foramen rotundum,to appear in the cranial cavity. Sarcomas springing fromthe heads of the ribs or processes of the vertebrae have beenknown to extend through intervertebral foramina and com-press the cord, giving rise to fatal paraplegia (Fig. 54, p. 91). SARCOMAS 67 It is also remarkable what slender barriers will serve aschecks to sarcomas. For example, it is no uncommoncondition for one of these tumours springing from theperiosteum near a joint to extend in all directions andenvelop the synovial membrane, yet be hindered by it frominvading the joint. ! Relation of s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectneoplasms, bookyear19
