Thymic sail sign

The thymic sail sign represents a triangular-shaped inferior margin of the normal thymus seen on a neonatal frontal chest radiograph. It is more commonly seen on the right side, but 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 pediatric 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
Section: Signs
Tag: thymus
Synonyms or Alternate Spellings:
  • Sail sign of thymus

Cases and figures

  • Fig 1: sail boat
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  • Case 1
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  • Case 2: right side
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  • Case 3
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  • Case 4
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