Xray

Silhouette Sign

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Silhouette Sign

  • Findings
  1. Seen on XRay films
  2. Loss of normal border between structures
    1. Different radiodensities form border on XRay
  3. Appearance of normally invisible outline
  • Interpretation
  1. Suggests infiltrates, fluids or air
  2. False Positives
    1. Poor film technique (poor penetration or alignment)
    2. Normal anatomic variants