According to the Enneking system, not true regarding an active benign tumour is -
Intracapsular
Margin of reactive bone
Thick rim of reactive bone
Extended curettage is treatment
Enneking active stage of benign tumors is stage 2 in which tumor is actively growing and can cause symptoms of pathological fracture.
Radiograph shows well defined margins with a thin rim of reactive bone. Tumor may expand and thin the cortex.
Treatment usually consists of extended curettage, e.g. in ABC.