al cavity will cast the shadowof a ring is easily seen from Fig. 111. The arrays traverse moresubstance in passing through the edges of the rim than in passingthrough the middle. This difference is the difference between thelengths ab and ccl. If it be a large cavity nearly full, the light reflex… … Fig. 167. may empty and become a large, bright reflex, or it may nearlydisappear because the mass of sputum has come to lie in line withthe empty space. If a faint reflex be observed without the presenceof pulmonary shadows, it is likely due to a dilated tube inbronchiectasis. A diluted bronchus…
X-rays · Radiography
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