. Roentgen interpretation; a manual for students and practitioners . are usually involved and the masses tempo-rarily disappear with great rapidity under roentgen radniatio.^Primary malignancy is rare. It usually occurs as a unilateral,irregular enlargement of the hilus shadow which shows a tendencyto grow in the direction of the affected bronchi. Metastatic malig-nancy, in addition to the enlargement of the hilus shadows, mayshow the characteristic, annular, sharply defined patches through thelung fields. Teratomata may invade the mediastinum in rare cases, THYROID 113. Fig. 89.—The same case


. Roentgen interpretation; a manual for students and practitioners . are usually involved and the masses tempo-rarily disappear with great rapidity under roentgen radniatio.^Primary malignancy is rare. It usually occurs as a unilateral,irregular enlargement of the hilus shadow which shows a tendencyto grow in the direction of the affected bronchi. Metastatic malig-nancy, in addition to the enlargement of the hilus shadows, mayshow the characteristic, annular, sharply defined patches through thelung fields. Teratomata may invade the mediastinum in rare cases, THYROID 113. Fig. 89.—The same case as Fig. 88. After a series of treatments with .r-rays thedecrease in the size of the tumor rules out aneurysm.


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