. Radiography and radio-therapeutics . aphy)should always be employed in these cases. Compression Stenosis of the (Esophagus.—This may be the result ofdisease in the vicinity of the oesophagus. The most frequent causes are : 308 RADIOGRAPHY (1) Lesions of the thyroid gland which cause enlargement; (2) glandularenlargements in the cervical region ; (3) malignant disease ; (4) aneurism ;(5) disease of the heart, attended by enlargement of the organ ; (6) tumours ofthe spine ; (7) lordosis ; (8) traumatism ; (9) cardiospasm. Tumours of themediastinum may also cause compression effects upon the oe
. Radiography and radio-therapeutics . aphy)should always be employed in these cases. Compression Stenosis of the (Esophagus.—This may be the result ofdisease in the vicinity of the oesophagus. The most frequent causes are : 308 RADIOGRAPHY (1) Lesions of the thyroid gland which cause enlargement; (2) glandularenlargements in the cervical region ; (3) malignant disease ; (4) aneurism ;(5) disease of the heart, attended by enlargement of the organ ; (6) tumours ofthe spine ; (7) lordosis ; (8) traumatism ; (9) cardiospasm. Tumours of themediastinum may also cause compression effects upon the oesophagus. Aneurism will give rise to compression effects at the corresponding levelof the oesophagus. It may often be extremely difficult to distinguishbetween this mechanical stenosis and an early stage of malignant diseaseof the oesophagus. Repeated examinations may be necessary before thedistinguishing features show all suspected cases the aortic areashould be carefully screened for signsof pulsation and Fig. 260.—Diagram to illustrate the appear-ance seen in a semi-lateral view of thethorax. The dark shadow at the top iscaused by bismuth food in a dilatedoesophagus. The point of stricture isseen at the lower extremity of the dorkshadow.
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