. Journal of radiology . ed thymus, substernal thy-roid, abscesses, echinococcus cyst anddemoid cyst. Fibromata, chondromataand lipomata (benign neoplasms) haverarely been found, and although theymay occur, they have not been demon-strated roentgenologically so far as Iam aware. Of the malignant neoplasms, sar-coma is more common than is usually primary in the formof lymphosarcoma. Lymphosarcoma,however may be secondary. Sarcoma-tous shadows vary in size and contourand those due to metastases often ap-pear rounded and circumscribed. Thesemay be small or very large, and usuall
. Journal of radiology . ed thymus, substernal thy-roid, abscesses, echinococcus cyst anddemoid cyst. Fibromata, chondromataand lipomata (benign neoplasms) haverarely been found, and although theymay occur, they have not been demon-strated roentgenologically so far as Iam aware. Of the malignant neoplasms, sar-coma is more common than is usually primary in the formof lymphosarcoma. Lymphosarcoma,however may be secondary. Sarcoma-tous shadows vary in size and contourand those due to metastases often ap-pear rounded and circumscribed. Thesemay be small or very large, and usuallymultiple. Lymphosarcoma usually mani-fests itself as a large single shadow andmay occupy the greater part of thechest. Metastasis frequently followsmalignant sarcoma of bone and mayalso follow sarcoma of the tonsils,cervical lymph nodes, the breast, orother regions of the body. Primary carcinoma of the mediasti-num arises from the mucous membraneof either the esophagus or trachea andrarely from the remains of the thymus. Figure X,—Large tumor shadow oc-cupying the right and left mediasti-num and half of right and left up-per lobes, due to metastatic lympho-sarcoma. Patient had lympho-sar-coma of the tonsil five months pre-vious which was operated and re-moved. *Read at mid-year meeting of the Radio-logical Society of North America, Boston,June 3 and 4, 1921. 2 MAX KAHN, M. , Md. gland. It may occupy either the rightor left side of the mediastinum or mayoccupy both sides. It is not, as a rule, confined to themediastinum alone and not infrequentlyinvolves the lung and pleura as of the breast not infre-quently metastasizes to the mediastinumalthough metastases may also be due tocarcinoma elsewhere in the body. It isdifficult to absolutely differentiate roent-genologically between primary andmetastatic carcinoma; however, theclinical history may help to shadows in primary carcinoma areusually irregular in outline and ofteninvade the lung and
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