| Note |
Over the years, the terminology and classification of vascular tumors of bone has been highly controversial and in literature a great variety of names has been proposed. Today, angiosarcoma is the most acceptable term for high-grade malignant vascular tumors of bone, as recognized in the 2002 World Health Organization classification. However, the classification of low-grade vascular to intermediate tumors of bone, in particular of haemangioendotheliomas, is extremely difficult due to the lack of uniform terminology and accepted histological criteria. Many authors have proposed different classification systems, but due to small numbers of cases, their large diversity and the lack of good correlation with clinical outcome none of them have been generally accepted so far. The large variety of histological features of vascular tumors of bone suggests that it should be regarded as a spectrum with on one side the overtly benign lesions and on the other side the frankly malignant lesions. In between there are the low and intermediate grade lesions in which numerous histomorphological diversity can be seen and for which classification is most difficult. |
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| Note |
Schematic representation of histological spectrum of vascular tumors of bone: accepted histological criteria to classify vascular tumors of bone are lacking. |
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Today, the most accepted classification of vascular tumours of bone is the 2002 WHO classification: Haemangioma and related lesions Angiosarcoma |
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