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Age: 3 months

Sex: Male

Indication: Fever

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Case #9


Findings

  • Mild hyperinflation and peribronchial thickening without focal airspace opacification or pleural effusions
  • Normal thymus overlying the right lung apex


Diagnosis

  • Normal thymus

Sample Report

Mild hyperinflation and peribronchial thickening without focal airspace opacification or pleural effusions, which can be seen with a viral infection.

Normal thymus overlying the right lung apex.


Discussion

  • Viral pneumonia is discussed separately
  • Make sure to always look at the thymus in young children so you get used to the range of normal (which is large). This is a classic “sail sign” configuration, which can occur along either side of the mediastinum, but is more common on the right.
  • It is important to distinguish the normal sail sign from the abnormal “spinnaker sail sign” of pneumomediastinum where the thymus is uplifted and laterally displaced with gas sharply outlining its medial margin


Images

Normal thymus sail sign.

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