241.
An abnormally deep costophrenic sulcus sign is noted in
a.pneumothorax in supine position
b.pleural effusion in supine position
c.pleural effusion in decubitus position
d.pneumothorax in standing position
e.collapse of lower lobe
ANS----a
With supine
radiographs, air collects anterior to the lung and there is no visible lung
edge. In this situation a pneumothorax can produce an unusually sharp
mediastinal border and hemidiaphragm and an abnormally deep costophrenic sulcus.
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