Unusual Presentation of Widely Metastatic Extraskeletal Osteosarcoma: Case Report

Unusual Presentation of Widely Metastatic Extraskeletal Osteosarcoma: Case Report

Jay Nelson, Mina Mousa, Joana Diaz, Marilyn Bui, Jamie Caracciolo

Abstract


Extraskeletal osteosarcoma is a highly aggressive malignant osteoid forming mesenchymal neoplasm arising from soft tissues which accounts for 1% of all soft tissue sarcomas. We report the case of a 46-year-old female with no significant past medical history presenting to an emergency department with a right lateral thigh mass following minor trauma. She was eventually found to have high grade extraskeletal osteosarcoma with rapid progression of disease resulting in patient demise. Differentiation of these lesions from alternative processes relies on specific imaging and pathologic features. Differential diagnoses include both benign and malignant etiologies such as myositis ossificans, soft tissue hemangiomas, and other malignant soft tissue neoplasms such as epithelial and synovial sarcoma.

Keywords


Extraskeletal osteosarcoma; mesenchymal tumor; sarcomatous tumors; soft tissue sarcoma; spindle cell neoplasm; extraosseous osteogenic sarcoma; sarcoma; cancer



DOI: https://doi.org/10.3941/jrcr.v15i4.4147