Abstract
AbstractPurpose Aneurysmal bone cyst is a rare benign bone neoplasm. The most common affected anatomical sites are vertebral column and long bones. We report two uncommon cases of orbital aneurysmal bone cyst.Methods Two patients presented with a sudden left proptosis and ocular motility restriction. Case 1 is a 74‐year‐old female whose visual acuity is perception of light in the left eye due to severe papilledema. Imaging studies of the orbit reveal a large cystic frontal bone tumor associated with a subperiosteal hematoma causing eyeball and optic nerve compression. A preoperative arteriography shows a moderate vascular blush. Drainage of the haematoma is performed. A local recurrence with hematoma formation occurred two years after the first surgery. Case 2 is a 45‐year‐old female. Imaging studies reveal a smaller cystic frontal bone tumour associated with a subperiosteal hematoma. The patient achieved full visual recovery after the drainage of the hematoma with no recurrence after treatment.Results In both cases the aneurysmal bone cyst was revealed by an acute orbital compartment syndrome due to a subperiosteal hemorrhage. A biopsy of the tumor within the frontal bone was performed during surgery and submitted to pathology for examination. Aneurysmal bone cyst secondary to another primary bone lesion was therefore excluded.Conclusion Aneurysmal bone cysts are tumors of unknown cause which occur more often in the first 2 decades of life. Complete surgical resection is not always possible and the local recurrence rate is 20%.
Published Version
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