Korean J Radiol.  2005 Jun;6(2):82-88. 10.3348/kjr.2005.6.2.82.

MR Imaging of Orbital Inflammatory Pseudotumors with Extraorbital Extension

Affiliations
  • 1Department of Radiology, College of Medicine, Myongji Hospital, Kwandong University of Korea. ejl1048@hanmail.net
  • 2Department of Radiology, College of Medicine, The Catholic University of Korea, Korea.
  • 3Department of Radiology, Gacheon Medical College, Gil Medical Center, Korea.

Abstract


OBJECTIVE
To demonstrate a variety of MR imaging findings of orbital inflammatory pseudotumors with extraorbital extension. MATERIALS AND METHODS: We retrospectively reviewed the MR features of five patients, who were diagnosed clinically and radiologically as having an orbital inflammatory pseudotumor with extraorbital extension. RESULTS: The types of orbital pseudotumors were a mass in the orbital apex (n = 3), diffuse form (n = 2), and myositis (n = 1). The extraorbital extension of the orbital pseudotumor passed through the superior orbital fissure in all cases, through the inferior orbital fissure in two cases, and through the optic canal in one case. The orbital lesions extended into the following areas: the cavernous sinus (n = 4), the middle cranial fossa (n = 4), Meckel's cave (n = 2), the petrous apex (n = 2), the clivus (n = 2), the pterygopalatine fossa and infratemporal fossa (n = 2), the foramen rotundum (n = 1), the paranasal sinus (n = 1), and the infraorbital foramen (n = 1). On MR imaging, the lesions appeared as an isosignal intensity with gray matter on the T1-weighted images, as a low signal intensity on the T2-weighted images and showed a marked enhancement on the post-gadolinium-diethylene triamine pentaacetic acid (post-Gd-DTPA) T1-sequences. The symptoms of all of the patients improved when they were given high doses of steroids. Three of the five patients experienced a recurrence. CONCLUSION: MR imaging is useful for demonstrating the presence of a variety of extraorbital extensions of orbital inflammatory pseudotumors.

Keyword

Orbit, Inflammation; Orbit, Pseudotumor; Orbit, MR
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