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- W2008805513 abstract "Abstract Extraskeletal osteosarcoma (ESO) is a rare malignant mesenchymal neoplasm that produces osteoid or bone and/or cartilage and lacks skeletal involvement. Reports in the radiological literature are scarce, and most case reports are focused on mineralized lesions. However, half of the lesions are not calcified or ossified, rendering the radiological differential diagnosis with other soft tissue tumors very difficult. We report the case of a 47-year-old male, with a palpable mass located within the vastus lateralis muscle. There were no intralesional calcifications on computed tomography (CT). On ultrasound, the central parts of the mass were hyperechoic, surrounded by hypoechoic areas. On magnetic resonance imaging (MRI), the central areas of the lesion were of low signal intensity on all pulse sequences. The peripheral part was slightly hyperintense to muscle on T1-weighted images and hyperintense on T2-weighted images. After gadolinium administration, there was heterogeneous enhancement of the peripheral part, whereas the central areas showed only minor enhancement. This case is particularly educational because it demonstrates imaging features that have not been previously illustrated, such as the presence of hyperechoic areas on ultrasound, which are hypointense to muscle on all MR pulse sequence. These areas seem to correspond to the presence of non-calcified osteoid on histological examination. This sign can assist in obtaining diagnostic biopsy material by identifying osteoid areas within the tumor." @default.
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- W2008805513 date "2004-03-01" @default.
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- W2008805513 title "Extraskeletal osteosarcoma: report of a case with unusual imaging features and histopathological correlation" @default.
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- W2008805513 doi "https://doi.org/10.1016/s1571-4675(03)00132-9" @default.
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