fig21

Figure 21. Sinonasal chondrosarcoma. (A) Coronal non-contrast CT demonstrates an ill-defined, low-attenuation mass expanding the nasal cavity and paranasal sinuses with osseous destruction and calcifications (arrow); (B) Axial T2-weighted MRI demonstrates the hyperintense cartilaginous matrix (yellow arrow); (C) Axial post-contrast T1-weighted MRI reveals the characteristic “rings and arcs” fibrovascular enhancement (red arrow). CT: Computed tomography; MRI: magnetic resonance imaging.