As of the latest update, Google Chrome and Microsoft Edge have made a breaking change to how file uploads are handled. Once your system installs this update, you will not be able to upload new images. Please use another browser until we can get it fixed.

Pneumosinus dilatans

Pneumosinus dilatans is a term given to an enlarged aerated paranasal sinus (hyperpneumatisation) without thinning of its bony walls. 


It was initially described in the frontal sinuses but may involve any of the paranasal sinuses.


It may cause pneumocephalus either by rupturing or because of a defect.


The presence of pneumosinus dilatans may be associated with an anterior skull base meningioma 3.

Differential diagnosis

  • pneumocele: enlarged aerated paranasal sinuses with thinned bony walls
Share article

Article information

rID: 24599
System: Head & Neck
Synonyms or Alternate Spellings:
  • Sinus hyperpneumatisation
  • Sinus hyperpneumatization

Support Radiopaedia and see fewer ads

Cases and figures

  • Case 1: right frontal sinus
    Drag here to reorder.
  • Case 2
    Drag here to reorder.
  • Case 3
    Drag here to reorder.
  • Case 4
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.