Description: As the name implies this is a localized increase of marrow elements which create a radiolucent radiographic defect. They occur more commonly in women in the midyears and show a predilection for the molar region of the mandible. They are especially common in extraction sites. Radiographically they seldom have as sharp a border as cysts and tumors. Scattered trabeculae may extend short distances into the defect or in some instances through it giving the defect afairly characteristic appearance. Naturally there are no associated clinical symptoms.
Etiology: The exact etiology remains unknown. No connection has been found linking the osteoporotic bone marrow defect with systemic disease or systemic need for increased blood production.
Treatment: Once the diagnosis is established no treatment is required.
Prognosis: Good
Differential diagnosis: This defect may easily be mistaken for cysts or tumors. In those cases where there is doubt about the diagnosis, biopsy should be done.