A system of surgery . odated between thewalls of the spinal canal and the cord ;but as soon as it begins to encroachupon and compress the soft cord againstthe resisting bony walls of the spinalcanal symptoms of paraplegia supervene,and eventually death. This is welldemonstrated in the specimen (Fig. 94),taken from a man 45 years of anterior crural nerve is occupiedby a neuroma the size of an orange. Itsexistence was accidentally discoveredafter death. Many of the roots of thelumbar nerve contain small are so closely congregated as to • INNOGENGY AND MALIGNANCY. 445 resem
A system of surgery . odated between thewalls of the spinal canal and the cord ;but as soon as it begins to encroachupon and compress the soft cord againstthe resisting bony walls of the spinalcanal symptoms of paraplegia supervene,and eventually death. This is welldemonstrated in the specimen (Fig. 94),taken from a man 45 years of anterior crural nerve is occupiedby a neuroma the size of an orange. Itsexistence was accidentally discoveredafter death. Many of the roots of thelumbar nerve contain small are so closely congregated as to • INNOGENGY AND MALIGNANCY. 445 resemble the annulated root of ipecacuanha, but the fatal result wasbrought about by a tumour the size of a nut springing from the rootof the fifth cervical nerve, which had squeezed and destroyed thecord in this important region. The preceding example illustrates the effect of environment inregard to the destructive results of a simple tumour, but it mustalso be borne in mind that environment influences very largely the. Fig. 95.—Side View of the Male Pelvis in an advanced Case of Eectal Cancer; to showinfiltrating tendency. baneful influence of malignant tumours, and although it is as yetimpossible to state why a periosteal sarcoma of the femur shouldbe one of the most deadly tumours known, yet very good reasonscan be adduced to explain the rapidly fatal course pursued by cancerof the uterus and epithelioma of the tongue. The infiltrating tendency of many malignant tumours explains,in some cases, the rapidity with which they destroy life. Take asan example the specimen shown in Fig. 95. It was removed froma man 33 years of age, who died from cancer of the rectum; nodisease was suspected to exist in the patient six months before 446 TUMOURS. his death. In this case the disease had not confined itself to therectum, but had crept down the bowel and infiltrated the skinaround the anus; it had also made its way through the muscu-lar coat of the bowel, and had involved the sacrum an
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