الفهرس 
Introductiion
Malignant Cartilaginous TumorsOnly 14 pages are availabe for public view
 |  | from | 116 |  |  |
| | | from | 116 | | |
Abstract
Cartilaginous tumors is one of largest groups of skeletael neoplasm .Its diagnosis is considered challenging to any radiologist which requires the development of diagnostic tool that is reliable, fast and accurate. Radiography remains the most reliable imaging technique for the diagnosis of a suspected cartilaginous tumor and assessing its degree of aggressiveness or non-aggressiveness.Most cartilaginous tumors can be visualized on x-rays of the affected bone. Radiographs are of limited value for the differentiation of Chs from Grade 1 CSs due to the high inter-observer variability of radiographic findings. As X-ray has a limited role in some cases .A need to new imaging modalities is considered essential in diagnosis and planning for treatment. These methods include CT, MRI and each one of them has certain advantage over the other. CT is used in flat bones where the pattern of bone destruction and the presence of matrix mineralization may be difficult to detect on radiographs. Occasionally, CT can be utilised as a method of local staging. CT does, however, allow the degree of extraosseous tumour to be assessed . CT angiography can also be utilized if the relationship to the neurovascular bundle needs to be further clarified. MR imaging is the modality of choice for local staging of bone tumors. It is able to accurately detect intra- and extra-osseous tumor extent and joint, nerve, and vascular involvement. MR imaging is useful in planning the surgical strategy, particularly with respect to limb salvage procedures. Dynamic contrast-enhanced MR imaging assists in the detection of viable tumor tissue during and after chemotherapy, and also in the follow-up. Recently there are many advanced imaging that help diagnosis of cartilaginous bone tumors as multislice CT, PET/ CT, and functional MRI which has the ability to look beyond anatomy to identify specific cellular characteristics. In addition, functional MRI can permit visualisation of the heterogeneous vascular properties of lesions. Malignancies have angiogenic features that distinguish them from normal tissues and benign diseases.