Which of the following findings on the chest radiograph is considered a secondary sign of em-physema?
a. Flattening of the diaphragm
b. Widening of the cardiac shadow
c. Narrowing of the space between the ribs
d. Blunting of the costophrenic angle
ANS: A
In patients with chronic obstructive pulmonary disease, there may also be an increase in the an-teroposterior diameter of the chest, with associated enlargement of the retrosternal and retrocar-diac airspaces and flattening of the hemidiaphragms.
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Which of the following is false?
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