Primary extraskeletal chondroblastic osteosarcoma of the pericardium: a case report and literature review.

Extraskeletal chondroblastic osteosarcoma is a very rare tumour with a grim prognosis. Clinical manifestations frequently are not specific and can be explained by associated pathology. In this report, we describe an unusual case of primary extraskeletal chondroblastic osteosarcoma located in the pericardium and present a review of the literature.