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Learning Radiology - Spine Sign

learningradiology.com · 275 words · saved by 1 readers

Normal Lateral Chest. On the lateral view, the thoracic spine appears to become darker (red arrow) as it approaches the hemidiaphragm because the x-ray beam traverses less dense structures than it does in the upper spine where the shoulder structures superimpose on it (white arrow). Spine Sign. On the lateral view, the thoracic spine appears whiter just above the hemidiaphragm (white arrow), the opposite of normal. The thoracic spine normally appears whiter in the region of the overlying shoulder girdle (black arrow). The left lower lobe causing this sign is also seen on the frontal radiograph, mostly hidden by the heart (red arrow).

Learning Radiology - Spine Sign Spine Sign General Considerations Normally, the thoracic spine "appears" to become darker (blacker) as you view it from the top to bottom on a lateral chest radiographic This is because more of the x-ray beam is able to penetrate the lower spine, attenuated mostly by only air in the lungs, than in the upper spine, where the beam is attenuated by the bones and muscles of the shoulder girdle Normal Lateral Chest. On the lateral view, the thoracic spine appears to become darker (red arrow) as it approaches the hemidiaphragm because the x-ray beam traverses less den

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