ORBITAL SUBPERIOSTEAL HEMATOMA, CHOLESTEROL GRANULOMA, AND INFECTION Evaluation with MR Imaging and CT - 09/09/11
Résumé |
The periosteum of the orbit (periorbita) is an important anatomic structure of the orbit. It represents the only soft tissue barrier between the paranasal sinuses and orbital contents. It is a relatively tough fibrous membrane that is generally loosely adherent to the surrounding bones except at the anterior orbital margin, lacrimal crests, margins of the fissures, and the canals.29, 35, 36 Posteriorly, it is continuous with the dura of the optic nerve and the dura surrounding the superior orbital fissure,27, 36 and anteriorly with the periosteum of the orbital margins. Thus, surgery or trauma posteriorly may result in cerebrospinal fluid leaks.36 The periorbita can be easily stripped from the bone except at the suture lines, where it passes through to fuse with the periosteum on the other side. In descriptive terms, the orbit has been divided into extraperiosteal, subperiosteal, extraconal, and intraconal spaces.
The subperiosteal compartment of the orbit, a potential space, is an important entity due to its unique anatomy, location, and susceptibility to various pathologic processes, such as hemorrhage, infection, infiltration of lymphoproliferative disorders, infiltration of en plaque meningiomas, and metastasis. Early diagnosis and intervention may be crucial in preventing significant morbidity in many cases. CT and MR imaging have contributed greatly to our understanding of orbital disorders. Both techniques are excellent for defining abnormalities within the orbital subperiosteal region. The detection of these lesions is based on tissue density and tissue intensity as provided by MR imaging. This article discusses the role of CT and MR imaging in a variety of more important subperiosteal lesions and aids the radiologist and the clinician to diagnose correctly orbital subperiosteal lesions.
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| Address reprint requests to Mahmood F. Mafee, MD, Department of Radiology, M/C 931, University of Illinois at Chicago Medical Center, 1740 West Taylor Street, Chicago, IL 60612 |
Vol 36 - N° 6
P. 1185-1200 - novembre 1998 Retour au numéro
Article précédent
- MR IMAGING AND CT OF ORBITAL INFECTIONS AND COMPLICATIONS IN ACUTE RHINOSINUSITIS
- H. Sprague Eustis, Mahmood F. Mafee, Christopher Walton, Jose Mondonca
- EXTENSION TO THE ORBIT FROM PARAORBITAL DISEASE : The Sinuses
- Hugh D. Curtin, James D. Rabinov
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