Case 12
History:
7 year old boy with right orbital mass
Findings:
Axial T1 WI before and after fat suppression showing a fatty mass in the lateral aspect of the right orbit, adjacent to the frontozygomatic suture, with smooth osseous scalloping.
Diagnosis:
Orbital dermoid.
Discussion:
Orbital dermoids are the most common developmental lesion of the orbit and account for 5 percent of all orbital masses. They occur most frequently in the upper outer quadrant of the orbit and in close relation to the frontozygomatic suture. Unlike dacryocystoceles which often are observed in neonates, orbital dermoids are usually seen in older children. At imaging, dermoids may appear with fat density, and, as they progress, they may be associated with gradual erosive changes in the adjacent bone (fossa formation). Progression is typically slow.
References:
- Geetika Khanna, Yutaka Sato, Richard J. H. Smith, Nancy M. Bauman, Jeffrey Nerad. Causes of Facial Swelling in Pediatric Patients: Correlation of Clinical and Radiologic Findings. RadioGraphics 2006;26:157-171
