Fig. 6.

CT-scan (A) showing massive osteolytic destruction of the sacrum at the levels S1 and S2 caused by ABC. (B) The lesions shows typical fluid- fluid levels on T2-weighted TSE imaging with the patient in supine position, which is a sign of internal bleeding within the cysts. (C) CT-scan two months after initiation of treatment with Denosumab showing initial sclerotic demarcation of the lesion and increased sclerosis. (D) CT-scan after one year of treatment demonstrating stable osseus reconstitution of both sacral ala.