Fig. 1
From: Imaging diagnosis and differential diagnosis of extraskeletal osteosarcoma
A 23-year-old man with EOS in the right thigh. A, B MR plain scan showing a mass with clear borders behind the femur in the lower thigh. The T1WI signal was similar to the muscle signal, and the T2WI signal was mixed. The parenchymal component had a slightly high signal, and the cystic part had a significantly high signal. C Enhanced MR scan showing progressively marked enhancement of the parenchymal component without enhancement in the cystic area (black arrow). D X-ray showing a mass resembling a muscle density mass (yellow arrow) without obvious calcification or ossification