Abstract
ObjectiveTo investigate the CT and MR imaging findings and differential diagnosis of malignant vascular tumors of bone. Materials and methodsCT and MR imaging findings of 18 patients with histopathology-proven malignant vascular tumors of bone were examined. Assessed image features included age, sex, location, CT findings, and MR imaging appearances and dynamic contrast-enhanced MR imaging. ResultsThe study group comprised 18 cases, of which 7 were categorized as low-grade malignant vascular tumors (LMT), and 11 were categorized as high-grade malignant vascular tumors (HMT). Malignant vascular tumors of bone showed osteolytic lesions with heterogeneous signs and enhancement, and frequently associated with soft tissue masses and peritumorous edema. The mean age of patient was respectively 34.7 years in LMT with 3 patients younger than 20 and 49.9 years in HMT with 3 patients older than 60 years. The mean lesion diameter was 3.6 cm (range 2–7.2) in LMT with two lesions <3 cm and 7.1 cm (range 3–13) in HMT with 3 lesions greater than 10 cm. LMT showed multifocal (57.1 %) and well-defined (71.5 %) lesions with residual bone (57.1 %), peripheral sclerosis (85.7 %), and slightly hetergeneous enhancement (71.4 %), compared to those of HMT with 9.1, 45.5, 27.3, and 72.7 %, and 9.1 % respectively. Also, HMT appeared as expansive (54.5 %), ill-defined (54.5 %), macroscopic necrosis/cystic (81.8 %) or hemorrhagic (27.3 %) lesion with pathological fracture (27.3 %), and often presented with obviously hetergeneous enhancement (81.8 %), compared to those of LMT with 42.9, 28.6, 42.9, 0, 14.3 and 14.3 % respectively.ConclusionsThere are some differences in the imaging features between LMT and HMT, while unifocal/multifocal, expansive, ill-defined, necrosis/cystic, hemorrhagic features with age, lesion diameter, peripheral sclerosis, residual bone tissue, pathological fracture and slightly/obviously hetergeneous enhancement highly suggest their differential diagnosis.
Highlights
In the 2002 World Health Organization (WHO) classification, vascular bone tumors were formerly categorized as hemangiomas or angiosarcomas (AS), with endothelioma being subsumed by the latter (Fletcher 2006)
To the best of our knowledge, there are no reports in the English literature describing the differences of imaging features between lowgrade malignant vascular tumors (LMT) and high-grade malignant vascular tumors (HMT)
The long bones in the lower extremity were predominantly affected in 3 cases (46.2 %) with LMT and 4 cases (36.4 %) with HMT
Summary
In the 2002 World Health Organization (WHO) classification, vascular bone tumors were formerly categorized as hemangiomas or angiosarcomas (AS), with endothelioma being subsumed by the latter (Fletcher 2006). The WHO classification of bone and soft tissue tumors has been updated in 2013, where a new type of vascular tumor, the epithelioid sarcoma-like hemangioendothelioma (ES-H) is newly described (Jo and Fletcher 2014). Malignant vascular tumors of bone (MVTB) are exceedingly rare representing
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