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Orbital Tumors - Herniated Orbital Fat

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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