Extra-skeletal osteosarcoma is a rare malignant soft tissue sarcoma which can cause a diagnostic challenge due to its non-specific presentation and soft tissue mineralisation, thus potentially mimicking conditions such as myositis ossificans. This review will outline the demographics, clinical presentation, key imaging features, differential diagnosis, management and outcomes of extra-skeletal osteosarcoma and serve as a reference to radiologists and other clinicians involved in the care of patients with soft tissue tumours and tumour-like lesions.

中文翻译：

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骨骼外骨肉瘤：综述

骨骼外骨肉瘤是一种罕见的恶性软组织肉瘤，由于其非特异性表现和软组织矿化，可能会引起诊断挑战，因此可能模仿骨化性肌炎等病症。这篇综述将概述骨骼外骨肉瘤的人口统计学、临床表现、主要影像学特征、鉴别诊断、治疗和结果，并作为放射科医生和其他参与软组织肿瘤和肿瘤样病变患者护理的临床医生的参考.