| Print Date: | May 23, 2013, 12:09 pm |
| Title | Orbital lymphoma, Extraconal masses |
| Text | Differential diagnosis for masses in the superolateral quadrant of the orbit include:
Lymphoma Pseudotumor Lacrimal gland or duct tumor Dermoid cyst Metastasis Hemangioma Schannoma or Neurofibroma Saroidosis Orbital lymphoma is the third most common cause of unilateral proptosis, following pseudotumor and orbital hemangioma. Non-Hodgkin B cell is the most common type. Lymphoma tends to surround adjacent structures, without eroding bone, and most lie anterior and superior in the orbit, in close proximity to the lacrimal gland. However, any area of the orbit may be involved. Presenting sympoms often include painless eyes swelling, proptosis, oculomotor/visual acuity defects. If there is no systemic involvement, orbital lymphomas are typically treated with local radiation. Chemotherapy is used in cases of systemic invovement. Classic cross-section image findings include: » CT: hyperdense mass that is well demarcated as compared to the hypodense orbital fat and enhancement with contrast. » MR: hypointense / isointense compared to hyperintense fat tissue on T1- and T2-weighted images respectively. Mild enhancement is usually demonstrated |
| References: | Harnsberger R. Head and Neck Imaging. Mosby, St. Louis; 1990:370-371
Flanders AE. Orbital Lymphoma Role of CT and MRI. Radiologic Clinics of North America. 1987;25:601-612 www.amershamhealth.com |
| Contributor | Paul M Michaud (Walter Reed Army Medical Center) |
| Peer Reviewer | James G. Smirniotopoulos, M.D. (Uniformed Services University) |
| Record Number | : 6833 |
| Created | 2005-11-06 21:36:20-05 |
| Modified | 2005-11-07 05:36:11.827279-05 |
| Category: | Neoplasm, hematopoietic |
| Location: | Eye and Orbit (exclude Ophthalmology) |
| Sublocation: | Extraconal |
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