Figure 1

Schematic representation of the target-shaped lesion at 3 months (a), note the hypodense area and the surrounding rim enhancement; after 3 months in case of local control(b,c), the lesion becomes smaller(b), retains its size, or even grows surrounded by a thin rim enhancement with total necrosis (c); and (d) in case of local recurrence, note the heterogeneous center surrounded by lobulated irregular thick enhancement; Note the shrinkage of the hypodense area that becomes hyperdense in all cases.