Orbital Tumors - Herniated Orbital Fat

General
Clinical features
- Rarely causes an intraorbital mass lesion
- Mean age 66 years, 90% men
- Prolapse is usually into superotemporal quadrant or lateral canthus
- Usually due to orbital fat herniation through a dehiscence in Tenon's capsule
- Manifests as unilateral or bilateral yellowish mass
- Does not recur
Differential diagnosis
- Pleomorphic lipoma: different clinical presentation; aggregates of bland spindle cells, floret cells and wiry collagen
- Well differentiated liposarcoma: different clinical presentation; enlarged hyperchromatic cells within fibrous septae