Idiopathic orbital pseudotumour

Clin Radiol. 2011 Sep;66(9):886-92. doi: 10.1016/j.crad.2011.03.018. Epub 2011 May 4.


Idiopathic orbital pseudotumour (IOP) is a benign inflammatory condition usually confined to the orbit. This may involve single or multiple intraorbital structures. Extraorbital extension can also occur. The imaging appearances often mimic other orbital diseases. Both computed tomography (CT) and magnetic resonance imaging (MRI) are frequently used to investigate orbital diseases, and it is important for radiologists to be aware of the variety of imaging appearances that occur in IOP. We present the imaging appearances in histopathologically confirmed cases of IOP and discuss the clinical features, natural history, and differential diagnosis of this condition.

Publication types

  • Review

MeSH terms

  • Diagnosis, Differential
  • Female
  • Humans
  • Magnetic Resonance Imaging*
  • Male
  • Optic Nerve Neoplasms / diagnosis*
  • Optic Nerve Neoplasms / diagnostic imaging
  • Optic Nerve Neoplasms / pathology
  • Orbit / diagnostic imaging
  • Orbit / pathology*
  • Orbital Pseudotumor / diagnosis*
  • Orbital Pseudotumor / diagnostic imaging
  • Orbital Pseudotumor / pathology
  • Scleral Diseases / diagnosis*
  • Scleral Diseases / diagnostic imaging
  • Scleral Diseases / pathology
  • Tomography, X-Ray Computed*