Bone Pathology

Incidence age <30; no sex predilection Location mandible, femur, pelvic bones, radius, and tibia Clinical Features Tooth mobility, proptosis, concurrent infection, and dysesthesia are reported infrequently. If the lesion erodes through the cortex, then an accompanying soft tissue mass will be present. When this occurs, it may be difficult to determine whether the lesion is

Cause Intraosseous accumulation of variable-sized, blood filled spaces surrounded by cellular fibrous connective tissue and reactive bone. Theorized that traumatic event, vascular malformation, or neoplasm may disrupt normal osseous hemodynamics and leads to an enlarging, hemorrhagic extravasation. Incidence Gnathic lesions mainly affect young patients (mean age 20 years). No sex predilection Location Aneurysmal bone cysts

AKA Traumatic bone cyst, hemorrhagic bone cyst, solitary bone cyst, idiopathic bone cyst Incidence Age 10 to 20 years old. Rare in children younger than 5 years and is seldom seen in patients older than 35. 60% in males Cause Trauma results in intraosseous hemorrhage which does not undergo organization and repair and liquefies, resulting

Central giant cell tumors of the jaws are benign but aggressively destructive osteolytic lesions. These tumors represent benign tumors of osteoclastic origin. The tumor is not a true granuloma (not a cyst). AKA Giant Cell Lesion, Giant Cell Tumor, formerly designated Giant Cell Reparative Granuloma (not a reparative response) Cause Multifocal giant cell lesions of

AKA Dense bone island, bone eburnation, bone whorl, bone scar, enostosis, focal periapical osteopetrosis Cause Focal area of increased radiodensity that is of unknown cause and cannot be attributed to any inflammatory, dysplastic, neoplastic, or systemic disorders Incidence Increased frequency in blacks and Asians. No sex predilection. Most arise in late first or early second

Cause Area of hematopoietic marrow that produces area of radiolucency. Can be a result of aberrant bone regeneration after tooth extraction, persistent fetal marrow, marrow hyperplasia in response to increased demand for erythrocytes. Incidence 75% are adult women Location 70% occur in posterior mandible, most often in edentulous areas Clinical Features Typically asymptomatic and found