Thymic sail sign

The thymic sail sign represents a triangular-shaped inferior margin of the normal thymus seen on neonatal frontal chest radiograph. It is more commonly seen on the right side, and can also be bilateral. It is seen in 3-15% of all cases. This sign should not be confused with the spinnaker sail sign which indicates a pneumomediastinum.

See also

  • thymic sail sign: normal thymus on a paediatric chest radiograph
  • elbow sail sign: the raised anterior fat pad on an elbow radiograph
  • spinnaker-sail sign (angel wing sign): thymus outlined in pneumomediastinum
  • retrocardiac sail sign: left lower lobe collapse on a chest radiograph
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Article information

rID: 41331
Systems: Chest, Paediatrics
Section: Signs
Tag: thymus
Synonyms or Alternate Spellings:
  • Sail sign of thymus

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Cases and figures

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    Blue Sail

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    Figure 1: photograph of sail
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    Case 1
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