Orbitofrontal cholesterol granuloma

Area of Science:

• Ophthalmology
• Neurosurgery
• Pathology

Background:

• Cholesterol granuloma of orbital bones is a rare clinical and radiologic entity.
• Typically affects men, involving the frontal bone near the lacrimal fossa.

Purpose of the Study:

• To describe the clinical, radiologic, and pathologic features of cholesterol granuloma of the orbital bones.
• To discuss the etiology and treatment of this rare condition.

Main Methods:

• Retrospective review of 27 patients with cholesterol granuloma of the orbital bones.
• Analysis of clinical presentation, radiologic findings, and histopathologic features.
• Evaluation of treatment outcomes following extraperiosteal surgical removal.

Main Results:

• The frontal bone, specifically the lacrimal fossa region, was involved in 26 out of 27 patients.
• Lesions caused osteolysis with expansion into the extraperiosteal space, leading to upper lid fullness and proptosis.
• Histopathology revealed a granulomatous reaction with cholesterol crystals and altered blood, consistently remaining extraperiosteal.
• Hemorrhage into the bone diploe is postulated as the etiology.
• All patients achieved a cure after extraperiosteal surgical removal.

Conclusions:

• Cholesterol granuloma of the orbital bones is a distinct entity characterized by extraperiosteal location and specific histopathology.
• Early recognition and surgical intervention lead to excellent outcomes.
• Accurate nomenclature is crucial to avoid confusion with other orbital lesions.