Bare orbit sign (sphenoid wing)

Bare orbit sign, is described as a characteristic appearance of orbit, where the innominate line is absent. The innominate line is a projection of the greater wing of the sphenoid, and its absence or destruction is responsible for this appearance.

It is the classical frontal radiograph sign of neurofibromatosis type I (NF1). In addition to bare orbit sign, it is accompanied by egg shaped enlargement of anterior orbital rim, bony defect in posterior orbit and anteroposterior enlargement of middle cranial fossa

Bare orbit sign may also be seen in destruction of sphenoid wing, most commonly in neuroblastoma metastases.

Share article

Article Information

rID: 17587
Section: Signs
Tag: signs
Synonyms or Alternate Spellings:
  • Bare orbit
  • Empty orbit

Support Radiopaedia and see fewer ads

Cases and Figures

  • Drag
    Plexiform neurofi...
    Case 1
    Drag here to reorder.
  • Drag
    Case 2
    Drag here to reorder.
  • Drag
    Case 3
    Drag here to reorder.
  • Drag
    Case 4
    Drag here to reorder.
  • Updating… Please wait.
    Loadinganimation

    Alert accept

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

    Alert accept Thank you for updating your details.