Objective: Long term efficacy of Aneurismal Bone Cysts (ABC ) treatment with Ethibloc.

Materials and Methods: Eighteen patients with ABC were treated with direct percutaneous Ethibloc injection. No severe complications were observed; three patients had a local leakage of Ethibloc through the injection site, self-resolving without complications. Follow-up lasted from 2 to 98 months.

Results: Seventeen patients showed a remarkable shrinkage of the cystic lesion with cortex thickening. The reduction of the lesion was not satisfactory for only one patient who has been successively operated on. Pain disappeared in 12 patients; it persisted in two and occurred occasionally in four, during follow-up.

Conclusions: In our experience the direct percutaneous Ethibloc injection is effective in the treatment of ABC and can be recommended as the first-choice treatment after a mandatory histological diagnosis; furthermore scleroembolization does not precludes any subsequent surgical approach. MRI must be considered in all the phases, including follow-up.