Magnetic resonance imaging of soft-tissue tumors of the extremities: A practical approach

Figure 11 Early subacute hematoma. A: Coronal T1-weighted; B: T2-weighted MR image of the knee. On T1-weighted image, there is a hyperintensity of extracellular methemoglobin at the periphery (long arrow) of the hematoma (which is seen 2-7 d after injury). Note a very thin low-signal-intensity rim at the outermost layer of the hematoma, indicating hemosiderin (short arrow). B: Coronal T2-weighted MR image shows overall hyperintensity of the hematoma (arrow), exception made for a very thin low-signal-intensity peripheral rim caused by hemosiderin.