الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Various bone disorders become manifest as cystic lesions. The differential diagnosis must include benign, active benign and malignant tumors and also non-tumorous lesions, such as osteomyelitis, metabolic and as a local manifestation of systemic disease. The most important and most frequent types of genuine bone cyst are juvenile bone cyst and aneurysmal bone cyst. (Maurer et al 1996).Patients with cystic bone lesions may present with pain or swelling or the cyst may be noticed incidentally on an X Ray taken for other reasons, Pain may indicate that the cyst is developing a stress fracture and needs urgent treatment, or it may be present for other reasons, The patient commonly presents with an established fracture through a lesion that appears cystic. (Sandra et al 2010).
The diagnosis depends mainly on different imaging modalities such as radiology, computed tomography and MR imaging. In many cases ,the biopsy and microscopic examination are essential.
Cystic bony lesions nowadays frequently seen with high rates of recurrence ranging between 20% and 50%, which necessitate searching for newer methods for treatment. Until the early 1980s, segmental bone resection was the treatment of choice. Because of its high complication rate it has since been abandoned. In the last analysis, the only well-established method for which long-term results obtained in studies of any size have been published is curettage of the cyst and grafting with cancellous bone from the iliac crest. The risk of recurrence depends on the age of the patient. A higher recurrence rate must be expected in children under the age of 10 years (Weller et al 1996).