Osteosarcomas are highly malignant neoplasms of bone that are challenging to diagnose. These neoplasms often show atypical behavior. In the initial phase they may present as nondescript bony swellings with an indolent growth rate, only to become overtly aggressive and malignant towards the later phase of the disease. Similarly, the histological growth pattern of this neoplasm can be quite diver...

epitheloid osteosarcoma (carcinosarcoma) of the bone is a rare malignant tumor and only a few cases have been reported in the literature. in this study, we report two cases of osseous carcinosarcoma (epitheloid osteosarcoma) with immunohistochemical studies.  the morphological and immunohistochemical data in these two cases support the theory of divergent differentiation of primitive, uncommitt...

Central giant cell granuloma is a benign, aggressive neoplasm composed of multinucleated giant cells that almost exclusively occurs in the jaws though extra-gnathic incidence is rare.Multifocal CGCGs of the jaws are very rare and suggestive of systemic diseases such as hyperparathyroidism,an inherited syndrome such as Noonan-like multiple giant cell lesion syndrome or other disorders.Very few c...

Introduction: Central giant cell granuloma is a benign lesion but sometimes has aggressive proliferation composed of multinucleated giant cells in a background of spindle and ovoid mesenchymal cells. Multifocal central giant cell granuloma of jaws is very rare and usually associated with hyperparathyroidism and some syndromes. We described an un-usual case of a 22-year-old man with idi-opathic ...

We present a patient with a distinctive lesion of the skull base, which, at imaging, showed expansile destruction of the sphenoid bone, hemorrhage with fluid-fluid levels, and contrast enhancement of a solid portion. These features ordinarily suggest either giant cell tumor or aneurysmal bone cyst; however, pathologic examination confirmed instead a rare variant of osteosarcoma of the telangiec...

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