Figure 18b. Ewing sarcoma in a 15-year-old girl. (a) Axial T1-weighted (600/12) MR image at the level of the diaphragm (D) shows an extraosseous extrapleural mass. A focus of high signal intensity (arrow) indicates intratumoral hemorrhage. (b) Photograph of the resected specimen reveals no bone involvement. A small focus of hemorrhagic degeneration (arrow) corresponds to the area of high signal intensity on the MR image.