MR imaging findings
| Patient No. | Location | Size (cm) | T1-weighted | T2-weighted | Enhancement Pattern |
|---|---|---|---|---|---|
| 1 | Right middle third | 1.4 | Central hypointensity, peripheral hyperintense rim | Central hyperintensity, peripheral hypointense rim | Peripheral irregular rim enhancement |
| 2 | Right middle third | 2 | Central hypointensity, peripheral hyperintense rim | Central hyperintensity, peripheral hypointense rim; perilesional hyperintense edema | A thick, irregular peripheral rim enhancement; perimural hypointense halo (target sign); perilesional diffuse contrast enhancement |
| 3 | Left middle third | 3 | Central hypointensity, peripheral hyperintense rim | Central hyperintensity, peripheral hypointense rim; perilesional hyperintense edema | A thick, irregular peripheral rim enhancement |
| 4 | Left anterior–middle third | 2 | Central hypointensity, peripheral hyperintense rim | Central hyperintensity, peripheral hypointense rim; perilesional hyperintense edema | A thick, irregular peripheral rim enhancement; perimural hypointense halo (target sign); perilesional diffuse contrast enhancement |
| 5 | Right middle third | 1.2 | Diffusely hypointense | Central marked hyperintensity, peripheral slightly increased signal intensity | Diffuse enhancement |
| 6 | Posterior third | 2 | Diffusely hypointense | Heterogeneously hyperintense | Diffuse marked enhancement with a nonenhancing central necrotic area |
| 7 | Posterior third | 3 | Diffusely hypointense | Heterogeneously hyperintense | Heterogeneously marked enhancement |