More black sign – an important normal lateral chest x-ray…
Normal = more black sign
Lower lobe pneumomia
More black sign – an important normal lateral chest x-ray finding (left image). It refers to the gradual increase in radiolucency (blackness) of the vertebral bodies when proceeding from upper to lower chest due to an increasing proportion of air. When air is replaced by higher attenuation material, such as in lower lobe consolidation (right image), then the lower vertebral bodies become abnormally radiodense (white).
from our tumblr blog: http://radiologysigns.tumblr.com/post/23274370027